On Day 1 we will need a process to request a new project, because plain users will not be able to create projects themselves.
In fact, we need such progress already now in this Labs instance. We can define the process as we document it, and fine tune it as we see fit, real request after real request.
I have started a draft at https://www.mediawiki.org/wiki/Phabricator/Help. @Aklapper & co, feel free fine tuning it while satisfying the current requests for Labs.