martin:
At your age and family situation, you would probably be best off setting up an IRA account and dollar cost averaging your way into a good mutual fund. Look for a fund with a good 10-15 year record and get a prospectus from them. Pick one with good long term performance and low expenses. Keep adding to it with monthly contributions (don't start using all your money at once -- invest in pieces over time).
After ten years or so of paper trading the equities markets, if you think you might be good at it on your own, play with a little bit of it -- maybe 10-15% of your total savings. In the mean time, read everything you can get your hands on about investing/trading and evaluate/modify your paper trading activities as though they were real.
Should you find your paper trading extremely successful such that you would be increasing your wealth literally by several hundred percent per year, 1) email a description of your exact methodology to me in secret HE HE HE and 2) slowly make some real money trades to see if you get the same success.
Do not do what so many do by rushing into something you know nothing about. Investing/trading in the markets is a profession. You have to train for it and respect it as a profession; because if you don't the professionals will eat you alive! I'm not kidding.
Just some friendly advice.
dg