This is my contribution OP:
1. Enroll in-state at your local community college with your current address and register for all-online freshmen classes.
Better yet, search around to find a community college in your state that offers all your Freshmen classes in a self-paced online format. That way, you won't accidentally fail out while you're trying to navigate the world during your first year out on your own.
Get smart on Exam for Credit options like CLEP and DSST. They're so easy, you can probably take a bunch of them cold right now with just what you learned in High School.
Get your AP and Exam for Credit credits transcribed at the community college and work with your advisor on a "start here and transfer to a 4 year" plan. If you're clever about it, you can breeze straight through an Associates.
2. Move to Montana and work part-time for a year while you do your Self-Paced Online freshmen classes. Establish residency.
3. Transfer into MSU and begin taking your specialized classes.