How much is "some money"?
I'd start by getting a credit card - usually banks have a student program that offers a decent credit card. If not, you'll get something in the mail. Try to get a card with no annual or set up fees, even if the APR is a little high. Build up your credit by keeping a revolving balance of about 1/3 your limit and paying on time (so with a limit of $1000, keep a balance of around $300 and just pay the minimum or enough to keep it around $300). People will tell you that it's a good idea to pay off the entire balance every month, and while this is responcible, it's not going to build your credit as quickly. Credit card companies like to make money off of you, and if you pay off the balance every month they're making none or very little. They don't reward that with great credit ratings. Eventually (months/years) you'll start getting better offers, which you should sign up for and repeat the process while canceling your old credit cards.
If you don't have a job, get one. You can use the income to invest with, and you might pick up some other useful skills.