Well, just off the top of my head, you will need a space to work in. Then you will also need to agree on some rules as to how it works - who can join, what (if any) are the responsibilities of membership. Since training methods are of concern for you, how will you regulate it? Will there be specific rules as to what things are unacceptable or will you try to promote a general philosophy. What will happen if someone violates those rules/philosophy? How will disputes be resolved if they deny it? Will you charge for membership and what will the money be used for. Who will keep track of it? Are you planning on just training together informally or will someone function as an instructor? If so, how will they be compensated? Cash, free ring time, etc. Will you be hoping to eventually host trials? That is a whole process that requires approval from the AKC, although fun matches can be held by anyone. If you are going to be holding matches open to the general public and intend to regulate the training methods people use at them, then you’ll need to be VERY specific in your advertising.
Is there really a need for an actual club or could you be ok with just an informal group who trains together - splits the costs of ring rentals, etc., or are you looking for something more formal? By us, there is one actual AKC sanctioned Obedience club, that I belong to but am no longer active in as Obedience has become a tiny part of things - it is much more focused on Agility now. There are also quite a few training centers which offer classes - instructors are usually experienced OTCH level trainers. For those you pay by the class, but many function as a club too in terms of volunteering to host events, etc. All decisions are made by the business owners though, which does make things run a lot easier than I have seen with clubs. If you have an issue with how things are done then you just go to another place. Most people I know who compete in this area go to classes at one of these “schools”, often belong to a trial hosting club as well and also get together with friends to rent space and practice.
Clubs seem to be a dying breed, which is a shame as they are the ones hosting trials.