Just go to a Hack Your Hackerspace meeting or open hours and let the host know you're new.
As a preview of the tour you'll get, here's the wiki documentation (I'm not promising it's all up to date):
By the way, this is an opportunity to help smooth out the onboarding process for everyone! People who have been around a while have the "curse of expertise"; they've forgotten what a new person needs to know. As you encounter speed bumps, I hope you'll mention them, on this list or elsewhere. It'll help us improve!
-Jay