Good luck. Small businesses run on tight margins and there's already a massive amount of people trying to extract more out of them.

I'm willing to bet you don't add any value whatsoever to their business (tech people typically don't "get" small business with physical stores) and I don't think sales techniques will help you do anything except maybe convince unsophisticated business owners...

As someone who's run a few restaurants before, if you don't have my cell number, you're not talking to me period.