You don't have to go through some big diet to loose your fat and get cut up. Just stop drinking carbonated drinks (coke,sprite, all of em), pretty much anything with a lot of sugar, candy especially. It's common sense for the most part. You also have to start doing cardio ontop of your weightlifting. Running, jogging, boxing, & jump roping are some of the best ones you can do. That's what'll really cut you up. The best strength exercises you can do are bench presses (inclines too), military presses, dead lifts, curls, & squats. You should do those first in your work out and then do all the smaller easier exercises afterwards (ex. stuff like tricep extensions, pullovers, flys).
Doing a full body work out 3 times a week is the best way to build mass and strength. It might be hard at first but after a while you'll get used to it.
if ya'll need advice just ask, I can pretty much give you an answer to anything you wanna know about bodybuilding & power lifting.