I also agree with the others and they have given the best info to help you out. Shop around you must be comfortable with who ever you sign up with. I signed up with the first demo I met and I wish I would have checked around a little more first. She is a really nice woman and friendly, but way too busy!!!!
My upline use to hold meetings regularly, but in the past couple years has changed dramaticly since things in her life have changed. We have meetings maybe 3 times a year if we're lucky. Other demos in her downline haven't wanted to get together without her either. It is understandable, but I regret having her as my upline some days. I've been a demo for 5 years and most of the things I've learned have been on my own or from other demos in the same situtation I'm in or orphaned all together. I also feel that we learn so much more every day and it's helpful to bounce things off other demos. That's why this site is so awesome!!!!
You will get so much in your starter kit, but like others have said....
order forms, hostess forms, stamp sets, and little by little you'll build your massive collection just as some of us have. I refuse to count my stamps....my DH would have a hissy fit if he ever found out how many there really are in my tiny stamp room.
One can never have too many stamps!