There are so many things to consider when opening a restaurant, any attempt to cover them all would make for a very, very long article.
That said, some are more important than others.
In a short article for law firm Collins Benson Goldhill, I discuss 3 things that it's vital to get right from the start if you're embarking on a restaurant project.
Concept - managing start up costs - knowing what you owe
You can read it here.