Hi lomza96,
You'll want to check for the service key together with your QuickBooks purchase from Amazon. You can also check your email for the information. Please check this article on how you can activate your payroll: Activate QuickBooks Desktop Payroll.
For future reference, here's an article about creating paychecks: How Do I Create a Paycheck For An Employee?
Please know you can continue to reach me here with any additional questions. I'll always make sure to help.