Your credit tells a whole lot about you.
At
http://www.equifax.com/ you can purchase copies of your credit reports from the 3 major agencies plus find out your FICO score.
Once you have your report they offer suggestions on how to raise your score, calculate where you r score will be if you pay so much on credit for any given # of months and so on.
It's a good idea to check your report at least once a year to prevent identity theft or dispute items that don't belong there.