For those asking, I put a 'Due Diligence Checklist' in Google Docs from a fundraising round we did a few years ago. It should give you a starting point of what information to have on hand:
https://docs.google.com/spreadsheets/d/17uAmJBwB3pztdmt4ozMy...
It's more geared toward 'physical' companies as compared to software ones, but many of the requirements are the same.