To me, it sounds like you have a lot of research to do before you're ready to invest. I'd suggest you read
The Neatest Little Guide to Stock Market Investing by Jason Kelly. It's a great introduction to investing and can be found pretty cheap on Amazon. And start reading
http://www.fool.com (also check out their tutorials for beginners).
When I first caught the investment bug I put money into things before I understood what I was doing and lost a lot of money.
That being said, Apple is a great stock to own. It's too bad you didn't get this idea in January, when it was much lower.
In past years, the stock has take a slight dip after the WWDC -- typically because the products or updates unveiled at the event don't live up to the ridiculous hype that preceded them. This year, however, might be different with the new iPhone. If I were a new buyer I'd either buy now or wait until after the WWDC.
Either way, Apple is easily headed to 200 and will be a safe investment for a long time to come. The iPod vanquished the Zune as if it were the Polish military, the iPhone is the hottest smartphone in the world, and the Mac is going to continue gaining market share. Imagine how much money Apple is going to make when today's Mac-loving college students graduate and become the Mac-loving professionals of tomorrow.
If you look at traditional metrics like P/E Apple stock really doesn't look that attractive at these levels, but Apple is currently one of those companies that defies traditional market logic because it has so many intangibles and enormous mindshare. It has a lot of potential, and even more hype.
PLEASE do your research before buying.