Welcome to the forums, Godwit. Will you be posting any pics? Please let us know if you have any questions about how that works, I'm sure someone will be able to help.
As for rock pools... You're bound to have them in the USA but I don't know if you call them something different. Here in the UK, the actual coast itself can take many forms. In some places there are areas of sand dunes leading across sandy beaches to the sea, in other places we just have the sandy beaches - and in other places the beach is made up of shingle, which is mostly small pebbles and not much sand at all, if any. However in some areas, the edge of the land is quite rocky and fringes of rocks stick out into the sea, often curving round. Sometimes the rocks are covered by the tide but when the sea has receded, it leaves behind small pools of sea water which for a few hours between tides aren't connected to the sea at all. The rocks also provide some protection from the full power of the sea so even when the tide is in, underneath the water there are ledges and groves which small creatures and plants can shelter in. As a result, those pools of water, aka rock pools
, can contain life forms that are different from those that live in the open sea or on the sea bed. Not all rock pools contain the same things - it depends on how deep they are, how exposed, how cold the sea is in that area, all sorts of climatic variables - but as a general rule you can find small crabs and shrimp, small fish, seaweeds and grasses, molluscs, etc. And you can often find small children trying to fish them out with a net and a jam jar.