Ok I recently reached level 85 on my rogue and thought I'd try out assassination for the first time since patch 4.0.1. Well i heard that it's the best raid and Dungeon spec for a Rogue but the problem is I see lots of players do atleast 9 - 13k DPS. I tried out the specc I cant seem to get a rotation or do lots of damage, I do atleast 4k DPS.

If i use Combat Specc i seem to do around 7 - 10k dps. If possible could somone fully explain how to use assassination please it would be much appreciated. I would like to use it but just cant use it at this present moment.
heres a link to my character armory http://eu.battle.net/wow/en/character/doomhammer/shalos/simple
ive only just started doing heroics but in time i will have all the decent gear. i would just like to know how to do the rotation and what glyphs i need talents i can sort out my self