I'll second mattmaroon's comments and say that you're probably barking up the wrong tree. You should try to self-finance or go after love-money (family and friends) first. Once you have traction and revenue a commercial or short-form business plan might make more sense - until then it's all wishful thinking.

With that said I have found SWOT (Strengths, Weaknesses, Opportunities, Threats) analysis to be a useful tool...

Cheers