I'm new to the class so there's a lot of things I don't know about it. Which talent tree, assassination, combat or subtlety is best for PvP? I've seen rogues lvl 30 rogues dealing 300, 400 damage in one blow which is probably because of poisons so what poisons are best for PvP? I'm a real noob in rogues aren't ? . Any tips for rogue PvP? Thx for the help

Definetely combat, and use a dagger and a sword or 2 swords or 2 daggers.

There's many ways to go if you are a level 85 PvP Rogue, if you are 85, I would say stick with the most common spec with Subtlety, and make new hot keys, level 85 poison use:

Main-hand : Mind Numbing Poison
Off-hand : Crippling Poison


As for twink rogues ( 19, 29, 39, ect.), I would recommend going as a combat spec, while holding either two swords, or a sword in the main-hand, and dagger for off-hand. As for poison, it should go something like this:

Main-hand : Deadly Poison
Off-hand : Crippling Poison

This guide is for a level 19 twink, if this isn't helpful. just find a simple guide in google:
http://www.wowwiki.com/Level_19_rogue_twinking_guide

Try reading this place for PvP tips as a level 85 rogue: ( This is one of the best )
http://www.arenajunkies.com/

Hope This Info Helps! Have Fun in the Game!!!!!

A combat rogue and swords. I have a rogue I gave up on him now I prefer my Druid, DK, and pala better but use evriscate and poisons that do DoT especially on other rogues :-)