Welcome to SMC!
My advice....do NOT buy GM stock. The Camaro introduction will have no effect whatsoever on the stock price. GM stock is completely driven by factors completely unrelated to their model line-up.
If you're looking to trade in the market, take your time, read and study...make sure you fully understand investing/trading. There's thousands of better stock choices than GM if you're just looking for a quick in/out trade.