What do you weigh?
The preseason should be used to get yourself ready for the "in-season" - when you'll be running your best. Part of that prep will involve dropping excess fat, sure, but I wouldn't make fat loss the priority for the preseason. Focus on building strength, muscle, and a base of conditioning in the offseason, but transition to more conditioning ("functional cardio" if you want to call it that) and get ready to run your fastest by the time the races start.
Especially if you're not training right now, you need to spend time simply building a base, not worrying about bulking or cutting.
Nope. If you want to build muscle, train that way. If you want to join the track team, train in a way that makes you a better track athlete. A side effect of that training will almost-definitely be a better physique, but training like a bodybuilder while wanting to run track will give you very slow, very inefficient progress in both.
Same reason some high school football players, soccer players, and basketball players don't have abs at all.Defined abs are not required to play well.
I've asked high schoolers if SAT prep courses helped them. They said no. However, the fact is that it can play a role in the final product. It's a factor, not the most important one, but one factor anyhow.