I’ve fixed a bunch of them, as well as tablets, and I really like the toolkit from iFixit. It’s great as a beginners set.

EDIT, now that I have a bit more time to elaborate:
It contains most of the bits you’ll ever need, including the weird ones. The only thing I use in addition to that kit is a good heat gun, citric based cleaning agent, and some of those glue-gasket-things.