If that was me, I would get the menu & order system set up, active socials, and get some slick business cards printed. I would then get a hold of anyone I know that does housekeeping, lawn care, plumbing, etc and ask them to hand them out to their clients. Offer the same in return. Give some to all friends who are supportive because you never know who they know or may run into.  

I would also do things like go out to dinner at nice places & leave a few cards wherever I could, maybe stick some on cars. Bulk mailing some flyers to narrowed down areas can be inexpensive, too.  

If there's any local wine & food festivals, see how much it is for a space. 

And I'd be flexible. Maybe start out offering a slightly cheaper meal service to middleclass acquaintances, to build some reputation.  

In a previous life, I had a housekeeping business that morphed into a concierge service over a few years time by basically doing this... but with cleaning.