Hmm...probably a Horizon 1 store, if it's Horizon 2 that's awesome, but not likely.
Here is how pay works. You get a commision. Say you make $800 in a two week period. Now, say you were making 7.50 an hour. If that is higher, say $900, you will get the $900. However, you then start the next period -$100. So you don't really get the base rate.
You have to work. You won't make money if you lay back. If you are in a bigger, busier store, you can sit back and not work, and there are enough other workers that you get away with it, but then you don't make money. At a smaller store, like the one I'm at, there are usually only two or three guys on in a dept, so you have to work unless you flat out ignore customers.
Where should you work? Well, income ends up about the same between the departments. Audio/Video has higher commission percentages, but generally sell less volume, and less service (the big payer). Computers get low percentages, but high volumes, and a much higher service percentage. It all evens out income wise. I worked in computers myself.
I didn't get benifits because I'm 18 so I didn't want them. But they offer a full suite of health/dental/retirement and other good stuff.