Welcome from central Indiana!!
Also, congratulations on your new metal detector. Now the fun part begins of learning that machine and all it's capable of.
I've had my greatest success in a mid sized city high school parking lot. I just googled all the high schools in the city, then went further to learn the year they were established. I found the oldest one which was built in the late 1800's; although, I'm sure it has been rebuilt since then. The parking lot grass islands is where it's at. Imagine kids getting out of their car in a rush on their way to class, or in a hurry to get home. Kids usually have lunch money and that usually consists of some change. In this day and age, many students either arrive or depart school wearing headphones listening to music, so if they do drop something, they more than likely won't hear it hit the ground. If they aren't wearing headphones, then they won't hear coins hit the grass in the islands of the parking lot. In only a 5ft x 15ft area, I found more money than I had found anywhere else in such a small spot. I'd estimate I've only covered less than 1 percent of detectable space. The city police did approach me on foot but they were only curious about the hobby and what it was like. This was during school hrs as well. I figured I'd go back on the weekends because I generally like to hunt in peace. I was just in town anyway, so I wanted to make the most of the trip.
Check out them older schools...
Happy hunting, gents.
Bluesguitar1