Best Group: http://www.skill-capped.com/content/14489/ideal-comp-for-rbgs-updated-for-patch-6-1/

Target Caller:

• Rogue → smoke bomb
• DK → grip

Flag Carriers:

• Rogue → sprint
• Blood DK
• Guardian Druid

What not to do:

• Do not tunnel a target
• Do not go on the enemy flag carrier if he has no stacks & the whole raid there peeling for him

What to do:

• Switch Often, just because you called the rsham 10 seconds ago do not be scared to call for a hard switch.
• Speak up, you have to be louder then everyone else. Your voice has to be commanding.
• Enable, „Target Count“ in your Battlegroundtargets add-on. This will allow you to see how many targets are assisting your target.
• Call for CC, on healers when you are going to burst
• Give countdowns, for example. Say: 5 seconds till AOE grip (via gorefiends grasp). The most important thing here is that you need to check for your teammates cooldowns, if you can line up an AOE grip with an ursols vortex, ring of frost and Solar beam, you can wipe the enemy team in seconds, getting this properly coordinated is fairly hard though, and will cause you alot of stress in trying to set up, even on high level, but it is definately worth it.
• Grip overextended targets even further away, and call the kill for them.
• Use battlestandarts, kill enemies battlestandarts
• Loot enemy corpses
• Stick together

Addons:

• Battlegroundtargets
• Deadly Boss Mods - pvp