Hedenberg,
The Gyroball is a myth. So is having control of three pitches as a h.s. freshman, IMHO.
Low 60's is not your typical 70-74 for pitchers on the freshman team.
And side-armed throwers are usually just that--throwers. There are a lot of command issues sidewinders face.
Sorry if I sound negative. I really do hope you make the team. Just be realistic. Find a good pitching instructor to help you with your velocity (if not arm slot).