The biggest is, Stay out of debt. I suspect you knew that.
I know you say you're a minimalist, but start building up a professional wardrobe. If you start now, you have time to search for things and build up a nice wardrobe from Goodwill (or similar); whereas, if you wait 'til you graduate, you can't find everything cheaply in a week or two.
In your junior/senior year, investigate the possibility of an internship. Your degree will be great, but a degree plus some experience and some professional contacts are better.
Use your college years to learn about money. I did not grow up with good financial examples, but I realized in college that I wanted to understand money, investments, etc. -- and I had a whole library of books at my disposal that would teach me what I needed to know. I'd go in between classes and read: Frugal living, real estate as an investment, retirement savings, old-fashioned skills -- I read everything. I was living hand-to-mouth during college, so I couldn't use much of the information I learned, but I learned.
Identify life skills you need to learn now. You say you're handy with cars and household fixes -- be sure you can cook a meal, sew on a button, etc.
I do not think living in your car is going to be a good choice long-term. Can you sleep comfortably? Have company over? Cook for yourself? Store work clothing and go to work looking professional?