A mailing list is a great resource. You can use it in a loop to get people from your website to Facebook and from Facebook to your website. It’s also a source of traffic and link clicks independent from organic and paid search. Building a mailing list is one way to help launch other sites and to help make yourself independent from reliance on paid ads.
We’ve come across many well-meaning marketers and entrepreneurs who create personal profiles for their brands, instead of an actual Facebook Business Page. That puts you at a huge disadvantage -- you’re missing out on all of the content creation tools, paid promotional opportunities, and analytics/insights that come with a Facebook Business Page. Plus, a personal profile would require people to send you a friend request in order to engage with you, and the last thing you want to do is make that more difficult for customers.