Re: UK citizen wants to studying nursing in the states
No chance.
To get a student visa, you have to prove you can support yourself & show them the money before the visa is granted. You cannot work to support yourself. You may work a maximum of 20 hrs, on campus only. After you finish your training, unless you have a way to immigrate, you'll have to depart the US.
There is NO financial aid for foreign citizens. There are SOME scholarships for non-US citizens, but very very few (and not much money). As a foreign student, you'll have to pay "out of state" fees, usually for the duration of your student visa - this means that you pay more (how much more depends on the school) per credit hour.
I suggest you do some reading at british expats, the US immigration website, and the websites of the schools you want to attend.
FYI, I am a foreign citizen working in the US at the moment (and also studying, but not on a student visa).
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