How do i know what level a junior usta tourny is?

well L1 is the highest level and L5 and L6 are the lowest levels. It depends how experienced you are, and how good of a player you are. if you are just starting to play in tournaments, start out with level 5s and 6s. you can look on usta.com for junior tournaments in your area, and the level and age group is listed with the tournament.