@buzz was one of the founders of HSBNE so he would probably have some helpful tips. This seems like a good article on adafruit about the general process. There are also some “design patters” here that may be useful in helping to identify and prevent problems.
However, make sure you apply a sensibility filter on everything you read. Starting a Hackerspace is a very niche thing and highly dependant on the people involved, the culture you want to create and the location/resources available to you. That last page I linked has some good reads, but also don’t take it as the absolute truth.
It’s probably best to start with a regular meet-up of like minded people and let it organically expand. Once it feels right you can start looking into creating a formal (legal) structure like an incorporated association. Also feel free to take whatever policies, rules and procedures you agree with from us and other Hackerspaces. There’s no point drafting everything from scratch when you can borrow and improve upon others work. Same as our portal and infrastructure projects once you get to that size.
A bit of advice I’ll give based on my experience at HSBNE over the last few years. Make people, safety and accountability your #1 priority. Don’t leave it to the point where you have to start doing things like safety correctly, do it right from the beginning and build it into your culture. Have clear expectations regarding safety, accountability and punishments for doing the wrong thing. Apply them consistently across the board and don’t make exceptions for specific people. Listen to your members and try your best to make everyone happy, but don’t do it at the expense of yourself or the core group.
HSBNE has been in a great position were we pay little rent. This means we have been able to invest the bulk of our resources into improving our tools and machines. However, it also means we are not self sustaining and are reliant on the support of our current landlord. Try not to let yourself get into a position like that. It’s great to build up amazing facilities, but there’s no point if you can’t sustain the group without a free/discounted lease.
Anyway, the most important thing is to have fun and stick with it, you’ve got a long journey ahead.