It has all the most important things.
The section "Onboarding the Language Mavens" lists a lot of other things one should know about. Alolita asked us about IRC, maybe that's a useful thing to know. I'd say CLDR but it gets complex and the checklist/walkthrough of tools is not the signup form. :)
Maybe also making an on-wiki list where to sign (to be able to use user talks and so on)?