Hi Lady Accapella,
I have done a couple of the new car shops and find they are pretty simple depending what MSC you are reporting for. If it is the same one I have been shopping for, they also have alot of online /internet car shops and phone shops to service departments, I find that starting off as a MS, these are some of the simpliest shops to do to get your feet wet. I recently did a service shop and for getting the oil changed for free and a nice paying shop, it was well worth the 20 minutes it took to input the data.
If you are going to do any gas shops, you might want to ask the scheduler what is all entailed. I have done gas shops for a couple MSC, and one BRAND was really simple, I was in and out in 15 minutes and paid well for the little I had to do, the other company and BRAND was not so simple and the pay was not equal to the job and only found out after I chose to self assign that it was a detailed 40 page booklet, YIKES!
The good thing is you are bringing management experience to the table and know what you would expect as a manager. I have also worked in management for a couple of those big places in Atlantic CIty, so think that that experience is helpful to the world of mystery shopping.