This is quite confusing I think, but I recently set up my companies Facebook page so I kind of have an idea how to go about it.
First you can NOT set up a business as a "profile" only as a "page". So what I did is set up a profile using my name and my work email address but I filled out the bare minimum of details (and I am not adding any friends to this profile). I then used this profile to create a page for my business. This is the page I am promoting to our customers - you don't become fans any more by the way you "like" a page now - I think the general effect is the same.
Anyway at the moment my page url is really long and not ideal for promoting. However, in the help pages on Facebook I discovered that if you get 25 people to "Like" your page then you can apply for a shortened url (depending on availability) e.g. facebook.com/yourbusinessname. So I am hoping to get to this level soon so I can get the shortened url. I have only 7 so far!!! And we have 2000+ customers!!!
Hope that helps!