I would not even think about ovens, employees, locations or costs at this stage. The product you will produce and sell is #1. Anyone can open a pizza place; hire managers and employees to run it. People do it all the time, and many close up shop. Just look at the auction houses liquidating used pizza equipment. Problem is people think it’s easy to make and sell pizza when the reverse is true. I’m sure many of the closures are due to lack of business plans and general lack of planning/knowledge, but also to a larger degree I suspect the product isn’t really all that good. With the multitude of pizza places everywhere, many using price as a core selling tool, pizza has become mundane and non original and many struggle to make a living. If you notice, pizza tastes pretty much the same from place to place; hence, everyone competes hard to get their share from the surrounding market. There are places too that are very busy and in my experience, those are the places that have better products.
What I would suggest as the #1 thing to do is learn pizza in order to develop formulations and recipes that are unique, original and that can distinguish your product from everyone else in that market. No need to consider where the place might be located or business plans – concentrate 100% on your product. Opening up a shop w/o fully developing your products ahead of time could lead to an unhappy experience for you. This can take a long time depending on your background and as one person suggested it’s good idea to work at a pizza place which will help you understand how to use equipment and the basics. You still need to develop your unique products and the primary way to get there is by researching, reading and experimentation.
After working at a pizza place for a while and learning (and you still want to do pizza), you can begin development on your pizza recipes/formulations. You can also procure commercial pizza equipment for 20% off list (because so many places close up) and if you have a garage, buy stuff a piece at a time or all at once and build your shop there. Buy a smaller mixer (20 or 30qt), sheeter, couple stainless tables, and an old school brick deck oven (older Blodgett 911 etc… for example); buy used pans, screens, and all sorts of stuff. You can build your shop for fewer than 10K easy. Use your “garage shop” for experimentation and leaning to develop the best pizza on the planet.
Then start looking for a location and develop the business plan.