Dale--Hope you don't mind my jumping in. The first thing is to decide what exactly you want to start with (you can always look to expand your concept later): Q joint? Q restaurant with more than Q as offerings? Bar? Catering on the side? Catering primarily? Lots of possibilites--what does your heart say?
Though a business plan is not required per se, I always counsel people who want to start a food service business to use one, especially if they do not have that background, because so much is involved. It gives you something to which you can refer and you can develop it as you go, in other words, you can pick the over-arching key aspects of the plan now, then start adding the nuts and bolts to each aspect as they become clearer. Restaurant/catering/food service development can be daunting but exciting (to me, anyway). There's the junk you have to deal with (city/county/state/federal regs), but you have that in most businesses.
Btw, a Sub-chapter S for funding can a be worthwhile route.