First, stay out of the Gulf at night or you may become something's dinner! You won't catch Blue Crabs off the beach. You will probably need an Alabama saltwater fishing license, then find a pier or bridge to crab from. Check with a bait shop on times and places to go. My first time crabbing was at Orange Beach off the west end of the seawall and I had really good luck - but that was in '68! Here is the story.