I have absolutly no idea what im doing here im trying to make a simple game, a guy with a sword and kills little balls that are trying to kill him. But i need to know how to make the little balls try to kill him. And i dont know how. Thanks in advanced 
Well, you need a bunch of things, namely : a way for the enemies to target, move towards and attack your player. Also a health system of some sort. Here’s a nice set of high quality tutorial videos that are explained well : BurgzergArcade.com is for sale | HugeDomains
Especially the parts 003 and 004 should interest you.