T e n n i s! ! ! ! ! ! ! ! ! ! ! ! !?

OK, i'm 14 and i reeeeaaaally want to join the tennis team in high school. They are a no-cut team. They are having lessons at the tennis courts on barry road. Monday/Wednesday for 3 weeks. What racquet should I buy? What shoes should I wear? I reeeeaaaaalllllly want to be ready in august, when it starts. I was thinking for buying something around $39 for my racquet. How should I train before it starts? Please help me!!!!!!!!!