First off, I'm not lv 60, or 70, which is why this is for WSG, and AV.

I'm currently lv 45, and I'm not going to go any higher (I despise pve)

Anyway, I've token down many of horde, 9 levels higher then me, its not hard, you just need to know the basics.

WSG-
Rogue can play many roles here,

Offensive
You can join the major amount of people on your side, rushing the flag constantly, or chasing down the opposing faction w/ your flag

Flag carrier
Even though, rogues are not tanks, you can still be effective at this. Stealth up, Imp sap and take out them, steal the flag, and sprint away, try not to go down the middle of the bgs If all else fails, inform your team that your going to pass the flag, and vanish.

Defensive
You can stay and help your team, Stand up at the very top and watch down, stealth(always). Imp fall(skill, passive) helps in maintaining stealth while jumping down. Try not to stand to close to the flag, as if you can be frozen and such. If someone comes in, don't charge them, let your defense buddy's get to fighting, then CS, if there arn't any more coming. If there are, get them. Chase the flag carrier out of the Flag room, but discreetly, mages frost nova, and you can get stuck.

Offensive(Honor farmer)
You could just farm honor also, Your team will probably be mad, but go ahead. Stand in the bushes off to the side, by the middle. Wait for a single horde to come into view. Remember, as a rogue, you always have to be mentally fleet footed, ready to sprint off at a moments interruption. If he has no friends, meet him, with a cs, then get to ssing.
When you get 5 combos, if hes doing a lot of damage, KS him. If he is about to die, Eviscerate him. If hes tanking you out, use SND. Rinse and repeat, when you get 5 combos. If you see the horde tricks(alliance), you might notice that he might be a pawn, if his friends come out, and start charging, gouge him, sprint off. If your going to die, vanish/sprint. You don't even need to stay in stealth, just get out. Only classes you should have a big problem is, Rogues of the same skill in better gear, Warlocks, and occ. priests.

AB-

Offensive
Again, go with the flow, but stay back in stealth, help get the flag, don't be the first to try and open, let one of your stupider teamies take the bait, and take whatever rogue/trap/totem there is. Then open. Basically strait forward.

Defensive
Stand right next to the flag your defending, if an enimy comes, let him start getting it open, then cs him, and kill. If theres lots, sap him, then sap the others. Yell INC XXXX (place). Hopefully your teammates will help.

If standing next to it wouldn't work, go hide inside of whatever your defending, BS, LM, STABLES, FARM, MINE. When they come, do whats above.

Honor farmer
Same as wsg, watch out for adds, Typically alliance will do the chicken sort of maneuver, horde and alliance will commence to running towards each other, and then the alliance will split out the other way, try not to keep on running if this happens.

In ab, always be aware that one of your rogue cousins will probably be hiding, to help out the 'one' guy defending their flag. Be cautious.

Talents
You should use dagger/dagger if you have the appr. number of talent points for mutilate. If not, dagger/sword, and assassination speced.

Combat is fine too, but not as effective, if you must use combat, try for maces, and mace spec, the stun is amazing. If not, do swords, nothing else is worth it, IMO.

Sub, I have no real exp, its basically hit and miss, you do lower dps, but you have more survivability, take this if you find that your semi-tanking in pvp more then quick killing.

Poisons/ Enchants & such

Keep crippling poison on one of your weapons at all times. The other can be instant, anything... I'd suggest crippling on your offhand, because it tends to hit a bit more.

Enchants-
fiery: always great

Crusader: eh, str isn't really our game, but go ahead if you can get it really cheaply.

icy: Unnecessary, you have crippling poison.

+ damage: great

+ agil: great

+ life/stamina: Its okay.

The end.