Raising money

I am finishing a business plan for a quick-service concept which will be my first restaurant venture.  I have a chef-partner who is helping with menu design and recipes, but I will be the only partner involved in the day to day operations.   I have about a third of the required capital myself and am starting to look for investors to fund the rest.  Does anyone have guidance on how to place a value on creating and executing the plan that is fair to both the founders and the investors?  I have heard of formulas that pay off the investors first up to a certain return of capital and then leave the founders with a certain perpetual ownership.  How do you determine what that perpetual ownership is once the investors are paid off?  Like everything, I assume it comes down to specific negotiations, previous experience, etc.  But any starting point would be helpful to me.

Keedick Coulter