There are various reason where you might feel like migrating to a Facebook page from Facebook profile.
Like, You created a profile for your product or a brand and to promote it online, now you feel like going to Facebook page which is actually meant for products, brands, local businesses etc.
The Facebook page gives more branding options to you like various social media plugins work with Pages, you can make landing pages and uses have to just like you rather than you confirming to their add request.
Click Here to do the migration form profile to business page. If you want to create a new Facebook Fan page here is how you can do it.