The key to running a successful restaurant is managing the numbers and that means having the responsibility for ordering, the cost of the food, hiring and managing the payroll and making sure all bills are paid. Of course, there is more to it, but if you have a solid foundation in these aspects, you will be in good shape to learn the new tasks that an owner should handle and a manager should not.
If you don't have that kind of experience, the obvious answer is to make sure you have access to it when you need it. This could mean hiring an experienced restaurant business coach to help you start your restaurant and who can advice you in whatever desicion you make.
However, the experience is more than just helping you once it's opened. If you don't have the right personal experience, you might have a harder time getting the money you need. Lenders, investors and homeowners are also very careful when investing money in a business run by someone who has never done it before, especially a business potentially as risky as a restaurant business.
Enlisting experienced business coach might not just be a good idea, it might actually be a necessity if you want to fundraise. Therefore, if you have any doubts about your own level of practical experience, you should start looking for a mentor who can guide you in every step you make.