I'm starting my own business. Following the "3f rule" (family, friends & fools), I decided to look for funding among my family members and friends. I want to ask them for confirmation of participation in my first project. The terms would be that the "friend" confirms that he/she will invest X amount in my project if and only if I find 100% of the required sum to initiate the project. The reason for such action is that I want to 1. validate the market and 2. address other relevant stakeholders and convince them by showing how much investment I can get.
I'm looking for a way to express that anticipated participation so that it looks professional and trustworthy for the other stakeholders yet doesn't discourage my friends from participation. It should be safe for them ("I will not give him any money unless he really starts the project") and for me (I will be able to assume these people will indeed participate in the project when the time comes).
Any suggestions are welcome!