It depends. If you're doing run and gun shooting, then you should include a zoom in there. You can do doc style shooting with all primes, it just might be frustrating due to the limitations.
If you're only doing narrative work and have time to setup shots, then all primes is okay.
What kind of shoots do you plan on doing with your 6300?
This is so frustrating. At $400 I would seriously consider buying one. At $2500, that's ridiculous. I can't justify buying a Super 8 camera that cost more than my GH5.
I am a GH5 user and I couldn't be anymore excited that the color red is now included with the camera. I'm sick of having to paint the record button myself.
I would buy a camera instead of renting just when you have a shoot. This way you can practice without spending the money on a rental.
That being said I wouldn't buy the SL2 at that price.
Try checking out the Panasonic G7 or the Sony A6000. The G7 has 4k and slow motion at 1080 . The A6000 has better low light, doesn't shoot 4K but does have slow motion at 60p. One isn't superior to the other in my opinion but I do prefer to shoot with the G7. That's just my preference though.
I would recommend Brooklyn College. I went there for film production and the program was pretty awesome. Honestly I never finished the program because I was freelancing and interning outside of school and started to get hired on a lot of jobs so I quit. The time I spent in the program though was really positive.
Also it's cheap and easy to get financial assistance.
I don't know if they do it anymore but in your intro production class you shoot 16mm and that was a lot of fun. Some people thought it was dumb but I think it's a good opportunity that a lot of people don't bother to try.
Tony and Taylor are making similar video essays for some of the Criterion releases.