Buy or Not To Buy??

I've only been fooling around with the Stock Market for a few months, and alot of it is still very foreign to me. Most of the stuff I have bought into are big companies that were selling really low such as Build-A-Bear, Sirius XM Radio, Gaiam, & LiveDeal. I haven't really had much of a return on these investments, but the Markets have been really bad here lately.
I logged on tonight & guess what?!?! My stocks had jumped $10!! No, you're right, that's not alot but OMG it is to me!! I've probably sunk about $150 into this, and it finally looks like I might start earning a return! Well, maybe not, but it's exciting anyway. :)