Know-How Exchange : Advertising/PR

Where? Who is your primary target audience? How do they decide when/where to order home delivery?

It seems to me that your primary target might be current customers who don't want to leave home to pick up the meal or actually dine at the restaurant. That would be a lot different from new customers who prefer home delivery and never go out to a restaurant.

Related question: Why did you initiate the home delivery service in the first place? How did you think you would promote it? What changed that now has you questioning the original plan?

To begin with? In-house, with serious incentives to sign up.

Honestly, the door is wide open on this topic. Search google for "restaurant promotion" and you will find all kinds of services, agencies, and blogs that specialize in helping restaurants promote and expand.