Shadow Priest Help

[dspri]

Hello all. I am looking for some help/advice for my shadow priest rotation. I know that I should be able to do more dps. However, I think its all in my rotation and the fact that I am a mouse clicker (never really learned any other way). I do tons of damage in AOE. I have reached the 30-50k on AOE trash in FL's. Things like the scorpions etc. However my single target damage is really bad. I ususally max out at 13-15 with trinklets popped etc. Can any one out there offer me some advice on what to do to increase my damage?

Thanks