Aggie-Kid,
I'd say the main thing starting out is safety. Saltwater fishing is absolutely fantastic, but it is not without some areas of caution.....
For example, make sure you've got sufficient boat for whatever you're doing....don't do like I did starting out and fish offshore in a 15 ft boat.

Your boat should be unsinkable, i.e. have upright flotation...I wouldn't fish open bays, jetties, or offshore without that.
Watch the weather. Summer thunderstorms can come up quickly between you and land...and that placid looking bay can turn into your worst nightmare. Don't get caught in one of those, believe me.
Reefs and other hazards are generally marked on maps and you can figure them out pretty quickly.
As to fishing, pick one area and work it good. Learn the water. Note the tides, wind conditions, water quality, etc. when you are successful and not successful. Select an area that is known for the kind of fishing you prefer and then become an expert on it.
Start out using a lot of live bait...until you know the feeding patterns better...and then switch to artificials, if you prefer, as you develop the knowledge of where the fish are and their patterns. Learning the patterns is most important...and it is really something you just need to do yourself, with time on the water, IMO. Talk to others, yes, certainly, but develop your own knowledge of patterns and you'll never be sorry and rarely ever skunked.
Don't expect to catch limits every time out and don't follow "what's hot" in other places. Learn an area, gradually expanding your knowledge base each time out. With that grounding, you can become an "old salt" and enjoy some great times on the water.