A good site for info on a rogue is -
www.roguespot.com
Your build is dependant on how you play but heres an example of a couple of grinding builds. (extract from the above site).
Talents
Most people recommend the Combat build 21/30 for grinding.
Advantages
The simplicity of the grind, Sinister Strikes followed by Eviscerate/Slice and Dice. You want slow swords on the main hand for maximizing your SS damage. Fast off hand weapon (usually a dagger) for poison procs.
Disadvantages
Kind of boring, grinding tends to get boring, having a Combat Build makes it even more boring. Also it’s my personal opinion that it does not do the same amount of damage that my Dagger build (technically the Osiris build). From tests done at level 18 I was getting 10K/hr versus 13K/hr with the Dagger build.
Assassination Talents (21 points)
Improved Eviscerate - 3/3 points 12-14
Malice - 5/5 points 35-39
Remorseless Attacks - 1/5 point 15
Ruthlessness - 3/3 points 40-42
Murder - 2/2 points 43-44
Relentless Strikes - 1/1 point 54
Lethality - 5/5 points 55-69
Cold Blood - 1/1 point 60
Combat Talents (30 points)
Improved Sinister Strike - 2/2 points 10-11
Improved Gouge - 3/3 points 16-18
Deflection - 5/5 points 19-23
Precision - 5/5 points 24-28
Riposte - 1/1 point 29
Dual Wield Specialization - 5/5 points 30-34
Blade Flurry - 1/1 point 45
Sword Specialization - 5/5 points 46-50
Aggression - 3/3 points 51-53
Subtlety Talents (0 points)
The Dagger (Osiris) build, 24/10/17.
Advantages
Huge damage, especially at level 18+ when you get ambush. Ambush > Gouge > BS, if timed right you will have enough energy to do BS right when Gouge is about to expire. Main hand you want a dagger with the most damage you can get, off hand again should be something fast. Dual daggers are how it usually works best. At level 22 your damage takes off due to Improved Ambush and then later Ruthlessness.
Disadvantages
This build requires skill, proper timing so that the Backstab lands. Moreover it will require you to move behind the enemy with Stealth and then move behind him again after the Gouge. It takes work but it has greater damage potential than the Combat build.
My preference was the Dagger build, it makes it exciting when you are grinding because of all the movement. If you feel that you do not have the skill or you want grinding to be a little bit more simple go with the Combat build, you will not miss out much.
Assassination Talents (24 points)
Improved Eviscerate - 3/3 points 30-32
Remorseless Attacks - 5/5 points 25-29
Malice - 5/5 points 33-37
Murder - 2/2 points 43-44
Ruthlessness - 3/3 points 45-47
Relentless Strikes - 1/1 point 48
Lethality - 5/5 points 38-42
Combat Talents (10 points)
Improved Sinister Strike - 2/2 points 10-11
Improved Gouge - 3/3 points 49-51
Precision - 5/5 points 52-56
Subtlety Talents (17 points)
Camouflage - 5/5 points 12-16
Opportunity - 5/5 points 17-21
Improved Ambush - 3/3 points 22-24
Initiative - 4/5 points 57-60