Only had Photoshop for a week now, would like to some advice on how to get better.
Considering you've had it a week, that's brilliant for my money anyways.
Just search some photoshop tutorials from google/divantart(or whatever it's called) also T-C did a tut on this website, give it a go mate. Also go pick T-C & TehBrain(or brian) brains.
Practice and keep going at it, eventually you'll pick up your own style that you like.