Every certificate has specific requirements, but generally you will need to:

Obtain a Student Pilot and Medical Certificate from an Aviation Medical Examiner

Receive flight and ground instruction from flight instructor on required areas of training

Study pilot manuals, guides and Federal Aviation Regulations

Perform solo flights on required areas of training

Successfully pass a knowledge exam on required subject areas

Receive a recommendation from a flight instructor, and successfully complete a practical exam, which consists of an oral exam and flight test with an FAA inspector or designated examiner.