I used to do this for years. Still have my detectors, although I've lost some of my accessories. I had a Fisher 1235X, CZ-5, and CZ-20 (waterproof). Yes, you all will find things. Lots of things. I had a website up, at one time. Haven't been on it in years, for all I know, tripod has taken that site down.
I probably dropped over $2K in detectors and accessory gear. When the recession started, heck, even before then, times were tough for us, so I started liquidating my gold, then finally my silver, and lastly, the bulk of my silver coins. All totaled, including the modern spendable coins, I pulled a profit.
Start looking into historical research. Find the ghost towns. Spots people would have gathered and money changed hands. If you get a detector, most of them have waterproof search coils, so you can go in the water, as long as you keep the box out of the water. You'll definitely find jewelry. My first silver ring came from a public beach, inches from the waterline, my third week into the hobby. My first gold ring came just days after that, from a woodchip playground on an elementary school.