Should I try out for football? Or not?

I've always wanted to play sports in high school but i've never had the courage to do so. last year i played my first sport, lacrosse and i had a ton of fun. this year is my last year of high school and i'd really like to try out for football. i've already talked to my coach and he said he'd love if i gave it a try. the thing is practices started last week and since i don't really know anything about football or how to play and stuff, i'm really behind.but i'm a hard worker so i'm sure if I try really hard I can do it. money is tight right now and my family and I can't really afford the $200 fee needed to join a sport and on top of that i don't have a ride to and from game or practice. I have my license but no car and with my parents working, i really cant borrow it. I've asked my friends for rides but none of them live close to me. I don't rally care if i'd have to walk the 3 miles to and from practice. Every time I try to talk to my parents about it and try to come up with a plan, they ignore me. So even though i really want to do it should i? plus I don't know if all of the equipment is provided or if i need to buy it. I have a mouth guard cup and cleats from lacrosse but nothing else. I have to let my coach know on monday by either being at the practice or not. (practice is 7:30 am- 3:00pm) and what if the team doesn't like me since i started too late? Is this an unreachable dream? or can I pull it off? how do i convince my parents to let me do this? Any advice will be helpful. Thanks