FA: Paper Trading.
What you didn't say is how you are going to treat the bid/ask situation. In addition to that, how are you going to verify what the price was at the time of day you bought or sold. And, what about the trick these worthless talking heads use - that is recommending a stock on 5-18 (after hours) and assuming that price, but after news hit. So, it gaps up the next morning, but they claim the previous day's price. Etc.
Len