I'm also a Junior in highschool. My jeep was handed down to me stock by my parents. After getting a job the mods quickly followed and it has taken me a year to get to where it is now. If your good with working on your own jeep and have access to the tools to do so I would suggest doing so to save on labor costs. As far as your first mods I would do the lift and tires first. If your set on a coil lift then you can just run coil spacers to fit the tires until you can afford the coils, shocks, and whatever else is needed for the height you choose.