Feel free to ask questions... I would suggest signing up with iSS (i Secret Shop) first. It will hook you up with a variety of pretty basic shops with a number of different companies with a minimum amount of "signing up."
The process itself is easy:
* Sign up with a company.
* Find their "job board" and apply for a shop, using their brief descriptions as a guide.
* Get notified that you have been accepted for the shop.
* Confirm (if needed for that site) that you still want the shop.
* Read the guidelines - making note of any "evidence" you need to collect.
* Perform the shop according to the guidelines.
* Fill out the survey about that shop online.
* Watch your email for follow up questions.
* Get paid. (Pay periods are different for every company.)
If you are looking for particular types of shops, you can get hints in this forum. However, nobody can divulge which shopping company serves which client. (We can tell you companies that have pizza shops, but we cannot tell you which company specifically has Domino's.)
Hard work builds character and homework is good for your soul.