3 tips of advice about your credit score:

1) Pay your bills on time.
Most people pay their bills on time, so if you don't then you'll be considered much riskier than the normal person.

2) Keep your credit card balances low.
Almost half the population has a credit card balance of less than $1000.

3) Don't have too many or too few accounts.
What's too little or too much? Basically you should only open accounts as needed. There's no reason to have more than 4 credit cards, but you should have at least one. People with no credit cards are considered as higher risks than those who manage credit responsibly.

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