When you look for an apartment, your credit score matters and you should know your score before you start looking for an apartment.
You can access a free credit report every year at AnnualCreditReport.com.
If you don't have a credit score, you should start establishing a credit history. Put a cell phone or utility bill in your name or open a credit card that you pay off every month. The sooner you can start a credit history, the better as you will need it throughout your lifetime. The Federal Trade Commission has more information about obtaining your free annual credit report.