AustinMom put it best when she said this site is designed to learn at your own pace.
In the New Mystery Shoppers forum there are a dozen or so threads at the top of the page which will guide you through everything from registering and getting shops to record keeping to taxes. At the bottom of every page is a link to the Official List of Mystery Shopping companies. Each entry has a link to discussions about the individual company.
Lastly there is a search function which you can use for discussions regarding certifications. The opinions vary. To me a lot of relevant information is provided to allow you to make an educated decision. Make sure when using Search to change the default from the last 30 days to all dates.
Equal rights for others does not mean fewer rights for you. It's not pie.
"I prefer someone who burns the flag and then wraps themselves up in the Constitution over someone who burns the Constitution and then wraps themselves up in the flag." -Molly Ivins
Never try to teach a pig to sing. It's a waste of your time and it really annoys the pig.