Tamara there are several ways to bring up your credit score but they all lead back to focus and consistency. It is not just enough to pay the minimum balance on your credit card bill. You have to be aware of the cycle of your credit card. Contact the credit card company and ask them "when is the closing date of the card?", this is the date that they will report your balance to the credit reporting agencies, it is also the date that finance charges are assessed (low balance means low interest). Make sure that on this day your credit card balance is as low as it can possibly be. 50% of your limit or lower would be fantastic. The closing date is usually a few days to a week or so after the payment due date, so be aware of making charges on the card directly after making a payment.
The other thing is to find out what you need. As Wanda Lowe-Merritt mentioned in an earlier response, you should sit down with a mortgage lender and find out where you need to be to qualify for the best loan at the best interest rate. They will tell you what your score needs to be, what type of proof you will need for your current housing payments and how many trade lines you will need.
It sounds like you are off to a great start.
My best to you,
Signature Realty Associates