Ah, okay. Test prep books will still get you through it fine though
Most likely, but 'least selective' is subjective and when your list is full of elite schools it doesn't mean a whole lot.
I think most unis either give you aid for one return flight a year (Presumably Aug - Julyish) or none and expect you to fund it yourself. Things like this are
very institution specific.
I wouldn't
expect to stay in the US after a course is over. Getting green cards to immigrate or other visas isn't the easiest thing in the world from what I've heard though I'd imagine having a degree from a top US university would assist somewhat in getting e.g. a company to sponsor you.
This stuff is again very institution specific -- You need to do your own research in that respect.
GENERALLY, though,
1. They'll want you to list one or a few potential majors but won't expect you to stick to it.
2. Depends on the institution but I think in many each department will choose their own major requirements? If so, it'll vary, yes.
3. Most places you just choose to take courses. It's not like over here where we've got very structured courses. You'd probably be given a long list of courses and be faced with the decision of choosing some.
4. Generally unis allow you to do e.g. a major, a major and a minor, a double major or even in some cases I've heard of a double major and a minor or a triple major.
Essentially, to my understanding, a minor is like a baby major - it shows that you took a lot of courses relating to the subject and passed them but not as many as you would need to do to get a major in it.
They don't usually have to be related but it might make it easier to get one if they are.
You really need to do some independent research though -- This stuff varies across institution so we can't give any definitive answers.