What is high school girls track like?

So i am a sopre in high school and interested in joining girls track. In middle school my gym teachers thought i was good at running sprints and stuff. first of all i used to dance, play basketball, soccer and softball and i tried lacrosse. Second of all, i was wondering about what you need to do in it. can you just choose to do sprints or do you have to also do like hurdles or pole vault (>.<) lastly, how much would i need to prepare if i was going to join. Its snowboard/skiing season so i've been doing that... the season apparently starts like in a month so is there anything i should do before then if i choose to sign up?