BIMSY'S PROFILE

I thought I'd join in at last after playing so many games.
And naturally, like all newbies, I'd like to make a game as well :D I've got a lot of optimism and ideas but no skills so don't expect much.

Right now I got two questions that I might as well get off my chest:

1, where can I find animated avatars that this website will accept?

2, Would it be illegal if I used music, pictures and other content in my games that does not belong to me?
I have played some games with images of celebrities and music like "mad world" so I am not sure where to draw the line.
Is it allowed as long as you don't take credit for it and refer to whoever made it in the credits?

As I said, I got a lot of ideas and I'm watching a lot of tutorials so I just want to find out where my limitations lie :)
I am only aming to produce tiny games for free and I might not even get that far, but we'll see!