Hi Courtney and Hannah, welcome to the RTA forums !

Wow, that's a mighty big plan you have there !

I really think at this stage you have to sit down and do some research as we could throw thousands upon thousands of suggestions at you on a trip this size and I doubt that would help much. Get the map out and search the RTA forums and road trip planning pages for thousands of ideas and as you build your trip you can keep asking questions. The nps site and state parks etc are also a good tool for planning when you are looking for natural wonders and camping ideas.
Anything more specific at this point then just ask, but having the budget to fulfill that dream is normally the first hurdle to overcome. What experience have you of long distance travelling and camping if any ? I would certainly plan on doing a few shorter trips away to get the feel of it first and practice putting up your tent and packing it all up, finding out about all the little things you need. [nothing worse than having a tin of beans and no can opener, Lol!]
One other rather important thing, life doesn't stop when you graduate and start college and the places you want to visit will almost certainly be there all through your lifetime so don't feel you have to try and do everything in one trip but take your time to enjoy the things you do see. I would rather have a well budgeted relaxed trip for a few weeks than one that is too busy and under funded.

Enjoy the planning