You are correct, I am a student at Inter currently. I'll try to answer your questions as best I can.
As for financial aid, you are applying to the US federal government via FAFSA, just like at any other school. Inter does have somewhat limited amounts available from the school. I have heard some people complain about not getting enough money, but I haven't really noticed a difference compared to the amount I got at my last school taking the differences in tuition into account. If this will be your first bachelors degree you have the benefit of getting grants from the government as well. This is my second so I'm not eligible. I don't know of too many people who are able to come here and live completely off of loans and grants, but most of the people I know are in the accelerated program too, so most of them are on their second bachelors as well and don't get the fed grants.
They will accept previous credits here for any (as far as I've heard) of the general education requirements. As for classes from the nursing school, I don't think that they would accept any. So, yes, Christian faith, Spanish, math, whatever else they tell you is required that is not directly taken from the nursing department. If you have taken religion classes, or language classes they will accept those in place of Spanish and Christian faith. Some people have gotten other language or world religion classes to count. For me they just looked over my transcript, gave me a paper that said I have to take Christian faith and none of the others.
Books are all bought online, so you can save some money in shipping if you buy them on the mainland, but I wouldn't buy books for a whole program all at one time. Things change, teachers want certain editions, things like that. You would probably pay as much getting them over here as you would just buying online and having them mailed here. This trimester we had a week and a half break so I went home to visit family and just had my books sent there (for the one trimester). They will give a booklist in the nursing office.
Living on the island is fun and it's gorgeous here, but it can be very frustrating at times. Rent is not too expensive, especially if you are coming from the LA area. You can pay anywhere from $200/mo to about $1400 a month depending on what amenities you want. I think that the average for people who have a roommate, AC, Internet, and included appliances are paying around $400/mo once you include utilities. If you are not planning on buying a car, pick your location VERY carefully. I can give you some suggestions if you want to message me once you decide that you are moving. Public transportation here is pretty much a nightmare from what I understand. I ended up buying a car, as have most of my friends, but not all, so it's not a necessity. Food is a lot more expensive here as well as everything else, but it is most noticeable in the grocery store. Movie theaters on the other hand are wicked cheap! We saw the new HP movie one evening for $6.50!
The school's accreditation is not in danger. It was evaluated and renewed as well as the ADN program gained accreditation, which we did not have before in October. What to expect from classes... well, there has been a lot said on this forum about classes so far. My opinion is that it is basically like being in a small classroom with a lot of really loud people. I don't know if it's cultural or what, but people in the classes I have taken NEVER shut up. I have only had one prof. who can keep them quiet and it's an active job. That's been really annoying to me personally. I don't know how other students are dealing with it. Up to this point (second trimester) nothing has been the least bit challenging. I am hoping for a little more of a challenge this time with Adult care 1. It is basically A&P plus the nursing care portion. The teachers seem to be of a much higher quality than last trimester.
I have not looked into taking my NCLEX yet but I think that there are some states that you have to jump through more hoops than others. I have heard that a lot of people are taking the test through the state of CT. Once you have your license though, you can transfer it to any state regardless of where you took the NCLEX.
Hopefully this will help and feel free to ask any other questions you think of. I will try to help as best I can.