Hi RFATCH,
This is going to sound vague, but almost any idea will work as long as you develop it properly. As far as your mom, I just told this to someone else, have her take a look at
http://actionguide.sitesell.com This is the exact guide you'll receive when you buy it. Of course you don't get access to the brainstorming tools but at least you can see what you'll be getting into.
I understand her concern. $300 is not a drop in the bucket so she wants to make sure this is not some fly-by-night scheme. I can assure you that's not the case with SBI!, but at the same time you also have to do your part and follow the guide, bring some of your own creativity and BAM (brains and motivation) as SBI! says.