If you are new to shopping, check out the "New Shoppers" area - it has a huge amount of information that will really open up the mystery shopping world to you. It's surprisingly large. There is also a list of some 200 MSC's linked a the bottom of this page. Many of us are signed up with well over 100 of them. Of course, feel free to ask questions as you have them.
Hard work builds character and homework is good for your soul.