I'm doing the exact same thing! The project has been put on the back burner until after our annual conference in June, but the first thing we did was send out a short survey to everyone asking for some general feedback on the community as a whole. About 125 people completed it. At the end of the survey, I asked that anyone interested in helping us further to share their name and email address.
Then I came up with a survey for those users (40) that specifically focused on their experience of joining the community and on what they thought would be helpful for new members. About 30 people completed that survey, and they gave us really valuable information.
Once our conference is over, I'm going to go back through their responses and start developing the Getting Started materials. I'm thinking it's going to be some sort of video series b/c pretty much everyone responded that they like watching online videos when they want to learn something. It's a great feeling to have member feedback b/c now I feel more confident in the direction we should go. And hopefully the people who participated will feel a bit of pride and ownership once we get everything out there.
Maybe this will help you? Or give you an option of where you could start?