Or parallels, or bootcamp…or ??? You don’t need to invest in a PC. Although, if you do, I recommend looking into a tablet (whole other discussion).
Solidworks has a great tutorial and help system.
Stop fretting over technology…seriously. Learn 3D. Pick one and move on. If your school focuses on Rhino, go with that. My experience is that you are 1 or two weeks away from learning any CAD package once you learn one. A couple days of training and a project or two and you will be learn another.
Every school is different. You will probably learn some manufacturing aspects from every school, but likely not enough.
Yes, its another CAD package. STOP WORRY ABOUT WHICH ONE. Just pick a CAD package before I come over there and strangle you like Homer strangles Bart.