New to this industry, need help/guidance/mentoring

Hello
I am relatively new to the game developers community. I have started to think about a game idea some 2 years - but it takes a while to actually dive into a development process. I've carried out some research to find out if my game idea has any chance in the prospective market. I am pretty convinced it does. Now I want to start working on execution, but there's no budget.
What I need is to transfer my game idea into a game document, a document that I can use to start raising funds.
I am looking for such sample documents.
Would appreciate any help you can offer.
Thanks.