I can tell you use MS Paint to do your animations with. I should know because I used MS Paint and Windows Movie Maker when I was your age lol. I will say it's a great tool to get yourself more comfortable with animations in general, but I recommend you switch to Flash 8 one day. It can really smooth out your outlines and make them less rough. You're obviously new, so I'll give you some slack. Just keep on practicing and animating, and you'll be making great toons one day. Keep up the good work! :)