Different classes have different requirements, based on their own designs. The State of Michigan only requires an expenditure of 30 rounds during a training program. Also, there is no state requirement that you bring your own gun. My guess is, you should be able to find a course at a gun shop where they would be happy to help you shoot what you think you might like to buy from them.
Once you have your CPL (it is a
Concealed
Pistol
License in Michigan), you may carry any legal handgun—revolver, auto, or derringer—that you can keep concealed.
Here is a
link to the statute that outlines the requirements for training.