How do I get a URL for my business page that allows access to non-Facebook customers?

Go to Apps, then search for iframe app. The one saying static html is the one, all you need to do is add it, and paste in your HTML. If you are already a coder, its very easy. Just basic HTML skills...

There is no difference.

I am on facebook but when I signed my e-mail and passeword it keep telling me that my account is unavalibled ,it been like that for two days now.I really want to get back on my facebook page and I...

nope! x

No. However, what you can do on their page is limited.