How Can I Train For Track And Field?

im a pretty tall person(idk how tall, idk pay attention to that) but next school year i wanna really tryout for track, i really love running, ahhhh! man i remember when i was in gym we had to run a mile, i was always first of the girls, and 2nd of the boys(im a girl) but now ever since we switched classes ( right now im in bio tech and chorus) i haven’t been running, could that effect my running? idk right now i have some big thighs, not like big big, just big, will that effect my running? i haven’t been running for a while, i race with my brother from time to time( yeah i always win! gets beaten by a girl!!) but anyways i really want to know some exercises that can help my running, i think my running is failing on me idk, but i haven’t been practicing, ever since i switched classes i stopped running and stayed inside, anyways track tryouts are in….10 months to 11 months, ok don’t tell me there’s nothing to worry about! since i have like a year! but i really want to practice practice practice!!! and then when its time, ill be ready! so if anyone out there can help me out how to get faster, or just go a longer distance( i can run a mile without stopping) i would be grateful, and also whats exactly is a sprint??? people used to call me grass hopper legs, because when i jump a long distance my legs like stretch out like a grass hopper, but i don’t get it, but anyways thx a lot im a girl so yeah…