Purpose
An overview of how uncoordinated and coordinated teams AB.
Team Setup
Depending on how your team is set up can already determine whether you will win or lose. Generally, a team is set up around 1 Frontliner (Frontliner - Warrior, Assassin, Dervish), 2 Midliners (Elementalist, Mesmer, Necromancer, Paragon, or Ranger), and 1 Backline (Ritualist or Monk). This guide will be based of a general AB team such as this one.
Frontliner
The person who is the frontliner is usually the person who leads the team, pings key targets, or even just directs people what to do. Whenever you play as the frontliner never beat around the bush when you're playing, if you tell people to do something make sure it gets done.
Ranger
One of the most important roles to any team. To teach people how to play ranger in an AB team I will use this build.
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This is the generic ranger bar for AB. Most rangers put in Mending Touch and Troll Unguent for the optional slots. What makes this bar better than a toucher bar
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is because of the utlity that is packed in this bar. While touchers are busy "hurr durr" and pressing one and two on your monk you get to think "What can I do to help lineback or help push for kill?"
Snaring
Key factor in your bar is how you snare. 
Crippling Shot is a very good utility skill that can be used both offensively and defensively. Rangers with common sense know when to switch between being offensive and defensive. Offensive snaring is simple as just using Crippling Shot on whoever your warrior is attacking. Snaring that target stopped him from kiting, allowing your warrior to train on it even more or maybe even kill it. Defensive snaring is just as simple although it does take some watching to do. Generally, when fighting the enemy frontliner (lets say warrior) is attacking your monk. Your monk puts up guardian and continues on healing as you fight. The warrior gets smart and times KD right after guardian. Your monk is down for 3 seconds (assuming he has stonefist's insignias) The whole team starts training your monk, trying to get the kill, your monk gets up and starts running. What do you do to help relieve him of pressure ? Cripple the warrior, the majority of pressure will be gone. I will talk about snaring later on in the guide.
Shutdown and Pressure
The other three skills on your bar, 
Savage Shot, 
Distracting Shot, and 
Apply Poison are just as important. Savage and Distracting are strong utilities just like Crippling Shot, and like Crippling Shot they can be used offensively and defensively. Offensively would be interupting key skills, 
Word of Healing, 
Guardian, or maybe even the enemy team's snare, Defensively would be interupting spike skills like 
Dismember, or 
Rodgort's Invocation/
Meteor. As for Apply Poison anybody you talk too will say that this skill is good. Poison itself is a lot of pressure, -4 Health Degeneration. When you're fighting another team use it to spread poison across as whole team, put that pressure on that monk!
What Will I Do If I Don't Have a Ranger On My Team ?!?
Although a ranger is useful in AB, you do not need to bring one. But one thing that every team must bring is a moderate amount of snares. Snares are key in AB. If they can't move, they can't cap. If you bring a different midliner always make sure they have a snare. Some snares are like
Also, notice how the majority of these snares are Elementalist skills, do not be afraid to go /E and spec into the certain attribute to bring one of these!
Elementalist
The elementalist is usually referred to as "nuker", this is because of how much damage your build does to multiple targets. The elementalist's primary job is too help push for kills and to make capping shrines a breeze by blowing up the NPCs at the shrine. The core elementalist build looks like this.
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Depending on your elite skill the bar can change. The most common elites for an elementalist bar is 
Savannah Heat and 
Mind Blast. If you are running Savannah Heat then it is wise that you also bring 
Searing Heat and 
Glyph of Lesser Energy. Doing this allows up to two more sills you can bring. Some elementalists prefer running 
Dash while some prefer to bring party-wide ims(increased movement speed) like
"Fall Back!". After that you are left with one slot left, a lot of people bring 
Aura of Restoration for energy management, but it is also very wise to try to bring a snare like 
Freezing Gust. Once again, snares are key.
Capturing Shrines
Depending on what faction you are on and what map you are on, nuking can either be really easy or just easy. Savannah, a heat then Rodgort's and it is done! Later on in the guide I will talk about advanced tactics when to cap shrines or killing NPCs.
Team vs Team
A somewhat harder aspect to play as an elementalist. Half of your damage is AoE which limits you to only Rodgort's Invocation and Meteor. Use these wisely. Meteor is a good a skill. At 15 Fire magic it does 112 damage, not only that but it also causes knockdown, which is a snare. Seeing it is a snare, that also means it is a utility, which means it can be used offensively and defensively. Most of the time offensively you'll casting it on whatever your warrior is attacking, not only pushing out a lot of damage but a KD to help your warrior finish the kill. What a lot of elementalists try to do is try to chain their meteor with a warriors KD, whether it is 
Shock or a hammer skill like 
Earth Shaker. Keeping a monk on his ass for ~5 seconds is really good, depending on the monk's skill he will die easily. Defensively is much more easy. Casting meteor on a stationary target that is training your monk (like an elementalist) or just knocking the warrior down to allow your monk a few seconds to kite will go a long way to help your team win the battle. I will talk about advanced tactics when you play against other teams.
Monking
Will write this later.
How To Lead An Uncoordinated Team
One of the hardest things to do in AB is to lead an uncoordinated team. Depending on the players it can big a HUGE burden or a breeze. Luckily you have two strong weapons in your disposal to lead, your keyboard and your compass.
Compass
Besides the fact that this is probably one of the most vital things in Guild Wars, you can use it much more for just looking at. You can draw! If your teammates are smart enough, they will notice that they will see a white line directing them to go that next shrine! Drawing IS important when it comes to AB, whether it is to go to whatever shrine next or which group to fight.
Ctrl + Space (Also Known As "Pinging"
Although it is less effective in most situations when it comes to leading it is still valuable. If your teammates aren't bright enough to recognize that you are drawing on the map you can still ping targets or shrines to tell them where to go.
How To Lead A Coordinated Team
It is generally mocked at when people will run a coordinated team in AB. Usually because coordinated teams us VoIP programs like Ventrilo or TeamSpeak. If you are serious about AB, whether it is just to win, for the rewards, or just fun use one of those programs. Coordinated teams are usually easier to lead than uncoordinated teams.
Ventrilo
This does not need to be explained. If you know what you are doing you can tell them directly and not indirectly.
Compass
Even if you are in Vent(short for Ventrilo) always know you have this tool. Be lazy and just tell them to go that way in vent while leading with the compass.
Ctrl + Space "Pinging"
This is important in coordinated teams. Seeing that you can talk to your teammates directly you can tell them why you pinged this target. You can tell them to put all damage there for pressure or you can do a "321" call and do a mini-spike to throw off the monk. Pinging targets can destroy any team you play against if you play correctly.