mjhadad: first of all never sell for under 20 dollars, because this is how much you pay in trading fees.
I'd like to clarify, that means $20 gain in total throughout all your shares of that stock, and not $20 in gain per share of the stock.
Example: I buy XYZ at $1.00 and it goes up to $2.00. I bought 20 shares. I've just gained $20, but I really only broke even because I paid $20 in fees. I should wait for further gains before I sell.
Meanwhile, I bought ABC at $1.00 and it has gone up to $21.00. I bought 20 shares. I just gained $400 - $20 in fees (assuming I bought all 20 shares in one trade) so I've made a profit of $380.
Bottomline, go dive in and just do it. After several months of practice, you'll get a feel of what feels right to you, and develop some personal methodologies. Researching all the different methods out there will help you improve, but research is only as good as how much you practice it.