I'm President of ours right now. I'd contact the state PTA by going through the national website above. Although I doubt you'll have things ready to roll by Saturday (?!!), they should have people there who will help you. Let me tell you the way we are set up - you should be similar. Each school has a "local" branch. Then some school districts have a "district" branch - if not, you bypass this step. Then there is a "region". Then "state", then "national". If you have difficulty getting help at any level, you just continue up the chain. Our region and our state have people called the "service delivery team" whose job (volunteer, of course!) it is to help you out in any way you need.
The region also offers training inservices (we had ours last week) where you might run into others in your boat.
Contacting the offices of other schools in your district to see what they have going might help out too - they could put you in touch with their leaders. Also, try to find out who the interested parents are and keep them involved in the process. They may be your officers. This Saturday, if you have nothing else, set up a sign up for interested parents and do some smooging (is that a word?) because this would be a big job without help!
Although I have really struggled with my local unit and some of the personalities there, I've really been impressed with the people at the higher levels. You are in kind of a neat position of not being stuck with fighting those who don't want change etc. You can set up what will work for you!