How big is your high school? Some huge HSs have two or even three freshman teams. Many smaller schools don't have a freshman team. Some don't even have a soph/JV team and everyone plays on varsity. If you don't make varsity, you come back next year and try out again.
Teams tend to have about 14-20 players at Fresh and JV levels and about 18-24 at varsity. Some players will move up and down among the teams. Varsity usually plays a longer schedule of games.
Biggest varsity team I've seen: 30 players.
Smallest: 7 players (had to forfeit when they reached that level due to injuries and grades)