I have the game, and have beaten medium and most of hard. This was my first time playing Guitar Hero, and I made the mistake of not taking the tutorial. I never learned about Hammer-ons or Pull-offs until I heard some friend talking about them at school.
Hyra:
The only differences between the Wii and 360 versions that I know of are the unlockable characters. The Wii gets Metalhead and Elvis/Elroy/something similar, while the 360 gets the God of Rock and the Grim Reaper. Obviously, the 360 also has better graphics and achievements. The Wii's only special features are rumble during star power (not that noticeable) and sounds from missed notes coming from the wiimote's internal speaker (incredibly annoying, luckily it can be turned off).