I'd suggest doing two things. Start looking for sales & marketing people and learn some yourself. Kick the marketing tires, interact with restaurants. You'll learn a lot from the process, even if it's just establishing that your product-market fit is perfect (usually not). Don't delegate all your client interaction to "sales" because you lose a lot in the process.

Unless they have a serious track record, let any salesperson earn their way in. Don't give up equity on promises.

Checkout saastr.com http://saastr.com/2013/02/12/what-a-vp-sales-actually-does-w... http://saastr.com/2013/04/02/the-48-types-of-vp-sales-make-d... http://saastr.com/2013/11/06/if-your-vp-sales-isnt-going-to-...

P.S. I have a friend who has a restaurant-chain SaaS app and he's not enamoured with their sales setup. Speaking to him next week. Someone really needs to make a company that handles the relationship with restaurants and connects to all these related solution providers.