scratches head I tried to convert my site (http://www.shiveringkittens.com) and just got back the original form, with no apparent PDF document to download. What'd I miss?
I am not certain about LLCs, but IME, once you have formed a corporation, you can apply for an EIN (Employer Identification Number, also sometimes called Tax ID) as a corporation, in which case, your personal citizenship may not matter.
While I would probably agree with the advice given here about contacting a lawyer, you could start with BizFilings.com's 800#, and see if they can give you some good advice for free first. (I've used them in the past, and while I had a few minor complaints, they do a generally decent job for little money. In any case, they won't charge you anywhere near what a lawyer would.)
Not to sound simplistic, but I think most any coder would work for a modest salary if the work were meaningful or exciting to him/her. My first job (coding) was for a company that made special software for financing insurance premiums. No offense to anyone in that field, but to me, it wasn't a terribly interesting subject matter.
On the other hand, I regularly see offers of people willing to volunteer on iPhone game projects just so they can learn the ropes -- it's just that interesting to them.
So, perhaps you should only offer the equity/money/bennies after you've found someone who's passionate.
Within the last few years, I've inherited a number of projects written using several of the above choices. While I don't want to appear _too_ negative, IME, apps produced using cross-platform GUI kits look bad on all operating systems.
I'd like to offer a "none of the above", which is to code the underlying "engine" of your app in C++, then connect that engine up to an OS-native GUI.