Clone this wiki locally
Start with the Overview. That's where the general goals are laid out.
If you want to add thoughts or links to Other Systems that might provide inspiration, design ideas, or working infrastructure, that's great.
Put your own desires and notes in User wish lists and notes. The idea is that they will be used to build a consensus wish list to help drive the focus down.
Eventually we'll commit ideas to the Design, which is now just an outline for areas we need to consider.