Get your private pilot's license. Regardless of which category of pilot you may fall under, you must meet the minimum FAR requirements in FAR 61.69, which states that you hold a private pilot's license and have at least 100 hours of flight time.
Undergo training covering the concepts, procedures and possible emergencies you may encounter, which is mandatory before you can work as a tow plane pilot. You can find more specific information related to tow planes and tow plane pilot procedures in FAR 91.309.
Learn to signal and maneuver. Tow plane pilots and glider pilots use signals and maneuvers to communicate with each other once the takeoff roll begins.
