Assuming you have acquired the ability to operate a rod and reel , you need to find a fishing pier. Most coastal cities have at least one public or pay-to-fish pier that goes out into the ocean. Some even have a pier that goes into a bay or river. These piers will often rent tackle. They do sell bait and terminal tackle (that's the hooks and sinkers and the like) and will help you rig the rod and reel if you did not learn either from step two or three above.
From that point, you may feel like you are on your own. But fear not; help abounds. If you ask nicely and appear to be struggling on the pier, there are any number of pier anglers that will jump in to help you and give you advice. They are a special breed of angler and some of the friendliest folks around. That's a major reason for sending you to a pier
Have a good cigar and regards