in his defense, he's a lot smarter and responsive than the other newbies that come on here. No need to bash the possible potentials ;)
I'm trademarking the term TPP for newbs that show promise on this forum :)
In other news :
As a rogue never gem for stam, ever (unless you're PVP'ing even then its debatable). Try to find an agi + stam or something else purple to fit that socket. Socket priority is hit then agi then ATK. You don't ever socket for anything else.
Your :
head -> prefferable get the T4 helmet asap because of the meta gem. Keep in mind that you may need to gem blue purple stuff to activate some metagems.
Neck -> i prefer
Worgen Claw Necklace because of the hit, keep the saberclaw talisman for use after you hit the hit-rating limit of 285 (with 5/5 precision).
shoulder -> Good gems selection, upgrade them if you can. Get exalted with either scryers or aldor for the better shoulder enchant.
Chest -> enchant +6 stats and gem either hit or agi in the sockets.
Bracers -> done.
Gloves -> try to get something other than stam in your blue socket.
Belt -> same
Pants -> upgrade asap and get the LW patch.
Try to upgrade your blue ring and blue trinket asap.
Double Mongoose is the needed weap enchant for rogues, do this when you think you hit your maximum range of possible weapons for a longer period (so you don't spend on Mongoose every time you get a new weap). For instance for me that's the badge fists as it's not likely for me to get BT gear atm.
As for speccing: i got killed when i posted as a newbie here for having blade twisting. It's bad, remove it. Also don't spec both backstab and sinister strike, it's one or the other as far as i know (never played combat daggers, just muti).
Don't ever use shiv as your main attack unless its about control (by using crippling), this is usually only in pvp.
Think thats about it. I just want to add the disclaimer that i kind of understand the theory behind rogue stuff but now also have to do this on my own rogue :P So no pointing back at me, I'm working on it ;)