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Not sure if my advice will be perfect because I'm sure there are some differences between the US system and the way things are in Britain, but I've got a bit of experience so maybe I can help.
1st thing, if you don't know what you're doing don't even think twice about hiring a broker. Sure it's gonna cost you a few $$ but I'm sure you will get a better return in the long run. Another option, that someone else mentioned, is to put your money into a high interest bank account. It's a fail-safe way to get a return but usually you have to commit your money to the bank for a minimum period so you won't be able to touch it for a while (this is how banks can afford to pay you such good interest). Also, you could get a better return if you invest in stocks if you take prudent (although luck is also a factor) decisions.
MSN Money is one of the most useful websites I've come across. It's written for people like you and me to understand and it has an excellent free Portfolio Managed programme so you can follow any stocks you've invested in. http://moneycentral.msn.com I haven't been able to find it on the US version of MSN Money but the UK one has a great virtual trading 'game' that you can use to get some experience in investing without actually committing any of your money.
Hemscott's really useful too. http://www.hemscott.com
Last piece of advice; investing in stocks is risky at the best of times. I'd definitely recommend that you look to make long-term investments instead of trying to make a quick buck by buying and selling the whole time.
Good luck.