There's lots of good rogue resources out there. You can pick pretty much whatever spec you like playing. Buy dual spec if you don't already have it and have two specs!
I personally like playing Assassination on my Rogue alt that I'm leveling. She's currently at 83 and her spec is
http://www.wowhead.com/talent#fcIfzsMdoGo0bZbhc (well will be at 85).
Although you may want the Deadly Momentum talent for leveling, up to you. I didn't find it necessary as Envenom refreshes Slice and Dice.
If you like doing PvE, EJ has some nice FAQs for 85 -
http://elitistjerks.com/f78/t110016-...ted_6_27_11_a/
Combat -
http://elitistjerks.com/f78/t111329-..._06_28_2011_a/
Assassination -
http://elitistjerks.com/f78/t110134-..._06_28_2011_a/
Subtlety -
http://elitistjerks.com/f78/t119013-...ty_compendium/
These all have nice information about what gylphs would be good to pick up, rotations, etc.