Trying Out For High School Football?

I'm in my junior year and will be a senior next year. I have never really played organized football before, though I have played the sport. I have tossed the football around at the beach and recently played touch football in gym a couple months ago. I was shocked when I scored a touchdown after being thrown the ball from half field. So mostly I wanna tryout for the team for my senior year. I'm around 160 lbs and 5'5. So mostly, I'm wondering what I should expect from tryouts (if we even have them) and what position I should try out for. I'm not really the most athletic, but I can be. I'm willing to work hard and take the contact hits that come with the game.