I'm creating a similar game myself also, called "Planet Invaders" (and I own "PlanetInvaders.com"). If you're going with "Space Invaders" be careful of copyright. ;)
Anyhow, in addition to tutorials on this site, on YouTube there's plenty of tutorials on painting and animating for games.
Ultimately I think you'd get a better response if you asked a specific question, like "How can I make my ship go to position x,y" instead of "How can you help me make my game". ;)
Jack of all trades, and master of some.