Restaurant?

I may only be in 8th grade, but I have very big plans for my future! I plan to open a restaurant when I am older. I plan to call it Just Desserts. And as you probably have guesses, it will only serve desserts. It isn’t exactly going to be a bakery though. But I need a little help. How should I plan oppening it. I am already going to have my friends taste test my recipes, but what else can I do to make sure it could be succsessful enough that it may even start a chain?