To master AP you'll have to start at the very beginning with easy tutorials. A good site for beginners is Bio Rust--> BioRUST.com :: Photoshop Tutorials. If you do these tutorials, you'll be off to a good start.
Once you check out Bio Rust, visit sites like Good-Tutorials.com ([Good-Tutorials - Photoshop Tutorials). Other good beginner sites are Tutorial Wiz ([url=http://www.tutorialwiz.com/]Photoshop Tutorials) and Photoshop Roadmap ([url=http://www.photoshoproadmap.com/Photoshop-tutorials]Photoshop tutorials](http://www.good-tutorials.com/tutorials/photoshop)). Again, start with easy tutorials, then as you're feeling more confident, start tackling more challenging tutorials.
If you feel yourself getting unmotivated from time to time, motivate yourself by looking at cool graphic effects you've seen, then Googling for tutorials on how to learn them. You'll learn the fastest this way!
Hoped this helped and good luck!