To compete as an amateur boxer you need a USA Boxing Passbook. The passbook is in essence an amateur boxing license.
In order to get a passbook go to usaboxing.org, and follow the registration process, print out your receipt.
Next, you will need to get a physical from a doctor (MD only). Ask Eddie for the form that you will need to bring to the doctor.
Mail the USA Boxing registration receipt, the physical examination form, completed by the doctor, a copy of your birth certificate, and two passport sized photos of your face to: CN Lopez, 2455 Ocala Ave, San Jose, CA 95122
You will receive you passbook in 10 to 14 days. You are eligible for competition. Of course, being eligible does not necessarily mean you are ready. This is only the starting point of your journey.