Starting a new business requires you to do many things that you may not enjoy doing. You may end up spending a lot of time focusing on tasks that you feel are mundane, unneeded, and downright archaic.
I'm sorry to be the one to tell you but you'll have to do these things. You'll have to pay the bills. You'll have to slog through agreements, contracts, and a bunch of paperwork for insurance, taxes, healthcare to get things set up. And, once you're business is up-and-operating, you'll need to take time to focus on the nitty gritty details of budgets, projections, etc.
But it isn't all bad. Even though these tasks are a bit boring and stressful they give you an opportunity to build your company like you build your product and to know your company inside out.
Build your company like you build your product
Every company in the world has to set themselves up as "a real business". But this process gives you the opportunity to build your company the way you'd like it to be long-term. How do you want to structure your company ownership? What are your goals with your company beyond the first product you're working on? Or, are you only building one product? What type of culture will your company have? What about employee benefits and the team itself? All of these decisions and more are started in the very beginning and molded over time.