Each beach has its own characteristics and each detectorist has different methods. There are so many variables, that it is hard to answer this question in a short amount of space.
The easiest answer is; At the ocean!
Personally, most of my ring finds at beaches have been somewhere between the average high tide line and the low tide line. I have found a few in the dry sand, but not many. The best times for me were the Fall, Winter and Spring. The summer was great for newer coins and some jewelry up high, but I liked the older stuff better.
The summer brought with it more sand. As the sand began to leave in the Fall, things became more promising. Winter storms could really churn things up and move goodies around, sometimes concentrating them into small areas or distributing them along lines. It was then up to me to discover those spots. I spent lots of time on particular beaches and learned much about the natural features. The older goodies are down deep and it takes some churning to get them into detector range. Of course, each beaches natural makeup has allot to do with where the goodies end up. Some beaches have very shallow amounts of sand laying on a clay, peat, or ledge base and others have an over abundance. This can make a big difference.
The beaches I am referring to are all in Maine, and this may not apply to other beaches as you go south because I don't know about other beaches structural makeup as well as tidal differences as you go south.
Good luck!......HH