Level should be either a USTA NTRP level examples (3.0, 3.5, 4.0, 4.5) for Men's and Women's leagues or a combined level such as (6.0, 6.5, 7.0, 7.5, 8.0) for Mixed leagues.
ALTA levels should be the requested or returning ALTA level for your team. Examples are (C1, B1, A1, AA1)