Hi, Conleynl, welcome to the forum. Becoming a mystery shopper means starting your own small business and working as an independent contractor for miscellaneous mystery shopping companies. It's time-consuming at first, because you need to spend time reading and researching and setting up your business. Then you spend additional time registering with mystery shopping companies, providing your personal information, SS# and signing an independent contractor agreement (ICA), which almost always contains a confidentiality agreement. Some ask for a writing sample or have tests for you to take.
A good place to start to find out what you need to know to get started is the New Mystery Shopper area, [
www.mysteryshopforum.com]
Good luck and happy shopping!