Whoa...a whole chain? Most people start with one restaurant. Then if that's successful, they add on another place. Etc.
You've already started out with one strike against you. Pizza joints are a dime a dozen. Which is to say, your competition is overwhelming and you are unlikely to find a niche that you can fill.
Your best bet is to do a survey of the market area to find out which kinds of food have little to no representation in that area. Pizza is not likely to be that kind.
When you find that gastronomic niche, find a proper location with high pedestrian traffic and a large dedicated parking lot. Then do a search for and hire the appropriate chef, who will come work for you on consignment, as a partner for a piece of the profits. Let the chef hire the kitchen help. Finally, hire a consulting firm whose expertise is in the architectural design of a restaurant. Where a restaurant is and how it presents itself is almost as important as the food it serves.
Restaurant startups are constantly ongoing. And they frequently fail because they've done little proper marketing research and because they are underfunded for the initial investment. If you have to borrow to fund your investment properly do it.
Took marketing courses at the post-grad level.