Urkishi, I just asked a similar question yesterday. Please see the post, by clicking on the link below.
[
www.mysteryshopforum.com]
However, if you go to Amazon.Com and do a search under “mystery shopping”, you will find a nice offering of Mystery Shopping books . . . and some contain information about starting your own msc.
Yet member Flash makes a good point about what they said (if you read their post), where they basically say, in order to have a successful msc, you must have excellent salesmanship and you must make yourself an indispensable item to your clients.
Wilson