Buy a field guide first for identification and some paper bags to put the mushrooms you find in, plastic bags will make the mushrooms rot fast and are not recommended. Then just go out and start...
Mushrooms from the genus psilocybe account for most magic mushrooms (i.e Psilocybe Cubensis, Psilocybe Mexicana etc). Any mushroom containing psilocybin, psilocin or baeocystin are referred to as...