Hi Jules -
I'm jealous -- you have an opportunity to start from scratch with the right focus (involvement) and no reputation or bad habit issues to overcome.
Graba cup of coffee and make your way around this site. There's a PTO v PTA section here:
http://www.ptotoday.com/ptovpta.html
You may also be very interested in our Start-Up Expert Guide:
http://forms.ptotoday.com/store/product.html?id=1001
Hint: if you call the folks at our help line (800-644-3561 x209) and tell them your brand new and looking for help, I'd bet you can even get the Satrt-Up Guide for free or close to it. Just don't tell 'em I said so

.
Good luck. Let all of us here on the boards know you're questions. You'll find it's a helpful crew.
Tim