In my opinion a simple website is a good idea. It gives someone the confirmation they're looking for when checking out your business. However, getting cold web visitors to initially buy into what you're offering will bring dismal results in most cases. People need to know, like and trust you before they'll open up their wallets. If your business can get recognized and  talked about by high-authority online media sites, that credibility can pay handsome dividends. Then, when they check out your website, all they need is your phone number.