It would seem that you would use mailers and other marketing to drive traffic to your website, where your prospects would learn more about you. I think in today's market if you don't have a web presence - both a website and social media - you're going to be at a disadvantage.
Totally agree here, and will add that smartphones alter people's buying habits, and the first thing people will do is look you up online, so not only do you need a website, but it has to be mobile friendly. Keep it simple, just a landing page initially with your value proposition and a form to sign up for more info or a number to call.