Search for schools that offer esthetician programs. Beauty and cosmetology schools offer esthetician programs--find one in your area using a directory. The Yellowpages.com or BeautySchoolsDirectory.com can also help you find a school. Specifically ask about their esthetician program since these schools usually offer more than one program of study.
Enroll in an esthetician program. You must pass through admissions to enroll. The school will set up an appointment for you to meet with an adviser. She can help you find financial aid, get up signed up for classes and go through an overview with you.
Take courses in airbrush tanning techniques. Be very clear that you wish to be state certified as a airbrush tanning technician. Your adviser can help you enroll in the classes you need in order to pass the state exam.
Finish all courses necessary to complete the program. Study hard and put all your effort into completing the classes. You will need this knowledge in order to pass the state exam.
Take and pass the state exam to receive your state license as an airbrush tanning technician. You may then look for a job at a salon or spa. Having a license means you shouldn't have much trouble finding a job with a reputable company.