Here's a link to mushroom identification. It is far from all inclusive. I caution. it is just the start.
Picking unknown mushrooms is very risky business. There are a good number of poisonous mushrooms in North America, and some of them can easily be mistaken for edible mushrooms. Asian immigrants to the U.S. fell victim to LBM's, little brown mushrooms, which look like straw mushrooms in China. Shitake mushrooms are not found in the wild in North America.
There are a great number choice, edible mushrooms that grow in North America. But you need trustworthy documentation, and preferably, someone who is well experienced in order to be safe. Myself, I have about5 species I can safely pick. Some of the mushrooms are deadly. Others are absolutely choice.
Seeeeeya; Chief Longwind of the North