I've read about licenses for a while now but I'm really supersticious when it comes to things like this and just want to make sure.
I'm making an android game that I plan to have ads in, and some in-game store with real money. Can I use the "Creative commons attribute license"-sounds or can I just use the "public domain"-sounds?
The attribution license is fine for that, provided you, you know, attribute.
But if in doubt, contact the creator of the sound directly and ask how they feel.