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Find out what you'll need to be prepared. Dress appropriately. Bring sunscreen. Prepare for sea sickness. Bring water.
Most charters will be equipped with everything you need from licenses, rods and bait, to life jackets, meaning that you'll just need to show up ready to fish and with the necessary payment. When booking your tour, ask if there is anything required or recommended that you bring. If you've never deep sea fished before, you need to charter a boat and go out with an experienced fishing guide. Even if you've deep sea fished many times, it's much easier to fish with a guide than to try to go it alone. Let a local show you where the fish are and have fun catching them yourself. If you have a boat already, you need to make sure you provide all the necessary safety equipment and licensed necessary to fish. Deep-sea fishing rods and reels are generally larger and stronger than fresh water equipment, and can be rented at many seaside fishing outfitters, or from other fishermen. You'll also need a few spools of high-tensile line for fishing. You will most likely get wet on the boat, so it's not a good idea to wear leather loafers and your most expensive pair of slacks. Wear clothes that can get wet or a bathing suit, and bring a clean towel to help dry yourself off. Sunglasses are also usually very valuable, since the light glinting off the water can be serious. If you're going to be out until the sun goes down, or you're going out in cloudy weather, it's also a good idea to bring some layers. It can get chilly out at sea, depending on the season, so an old hooded sweatshirt can be an invaluable clothes item, as well as some sweatpants if necessary. Leave cellphones, jewelry, or anything that you'd hate to lose or get wet back on shore. In the event that you get soaked, you don't want to have to lose anything valuable. Most boats will be at sea for several hours. Even on cloudy days the sun reflects off the ocean, making sunburns a serious possibility. Apply and reapply high-SPF waterproof sunscreen to help protect yourself from sun damage. The ocean can make the boat very rocky. If you begin to feel sick, stay on the deck, where there is fresh air and less rocking. If you are prone to motion sickness, take medicine before boarding. If you already know you're prone to motion sickness, take half a Dramamine the night before and another one an hour before or so before you get on the boat. Keep your eyes on the horizon while you're out, because it's stationary and it will help you from getting motion sickness. Be sure to drink plenty of water, because the rays of the sun reflect off the water which can make the day even hotter making you lose liquids faster. Any motion sickness effects will be emphasized when you're dehydrated, and you'll feel a lot better if you drink plenty of water. It's common to drink alcohol on certain fishing trips, but make sure you supplement any alcohol you're drinking with plenty of water. In bright sun, you can get dehydrated quickly and could wake up to a serious hangover the next day if you're not careful. Not to mention that alcohol will lower your hand-eye-coordination, making you a less safe fisherman. Moderate your drinking and have plenty of water.