From reading the demo forum, there seems to be great variation in how successful demos are at attracting customers. It is like any other sales job -- I think that some people have a pleasant assertiveness that just attracts customers to them!
I echo the suggestion to go online to
www.stampinup.com and do the demo locator thing. That will give you an idea of where the closest demos are to you. If you are serious about making money at this, don't select an upline just because she is your friend. Rather, select your upline carefully, as that person should be able to provide you with ideas on how to find customers. Interview them and ask them how many customers they have; how long were they demos and how much time per week do they devote to their business. Find out what specifically they offer to their downline by way of help in growing their downline's business.
Also, you only need a few good customers to meet your minimums. I have a very small customer base -- about 7 ladies, almost all my customers are from my office. Getting 7 folks to spend a total of $100 a month is not hard. I got known there as the lady who makes hand stamped cards and they just asked me about it. Didn't even have to solicit. If I haven't got an order from someone in a while, I leave a little thank you or thinking of you card on her desk, using a set I know she doesn't have, or something new like to her, like the shimmery white paper or the watercolor crayons. Bingo -- an order!
Even though you are not working, you still must send gifts and cards to folks. Look for ways to send hand stamped items to folks in your town. Just make sure you have your little stampin up logo on the back! Eventually someone will ask. NONE of my friends is interested in stamping and would never come to a workshop; other demos invite the whole neighborhood and get a crowd.
SU sells magnetic door signs for your car and window stickers to to help spread the word. (I haven't gone that far). You can take your catalog to doctor appointments. You never know who might be looking over your shoulder!
Unless you are financially strapped, and really can't afford the starter kit, I think it is worth giving it a shot as there is no penalty for dropping out if you find you can't make your minimums. good luck