as many shares as you can afford of stocks that are going to net you the biggest profit in the shortest amount of time. There might be a StarBond going up $30, for example, but not for 4 months. So that ties up your money too long. If a weekend opener is doing really good and the MovieStock will have a big adjust, invest all you can into that. You'll get your money back at the end of the weekend.
When I first started here in 2008, I just spread my money around to different stocks. It didn't get me very far. It's a fun game so stick with it. There's some great resources (HSX Dude, KaiGee, Port Monkey, etc) to help you along the way.