how do I set up a Facebook page for my business?

[Logical Reasoning]

I'm assuming that what you want to know is how to only have people interacting with the facebook page both when on the page itself and while interacting with content on the website. This is setup by default on the page but when setting up "like buttons" or other website plugins on the website you need to "point the url to be liked to the facebook page." So when people are on your website - when they press like they will not be liking the websites url, but indeed the fanpages url, therefore number of fans will be aggregated from that source.