I am the director of a start-up game development group (I say "group" because it is not yet an official company). I have recently gained the willingness of a few coders who are willing to help me with the project, but they are asking for documentation.

I understand the need for documentation, and I have a lot of our ideas in a few different documents, but I imagine that I will want to organize it in some way that the developers can understand individually as well as collectively.

Is there anything I should leave out of such a document; if so, what kind of things? Is there an appropriate template for this kind of document; if yes, where can I find it? Is there anything else that I should know to offer the coders before they begin their work?

I know that I have many questions being asked here. I hope that isn't a problem. Thank you in advance for any guidance!