Merlin, there is an entire form of kayaking that is oriented to just
fishing. Myself, I do the type of kayaking that is specialized for
travelling long distances, through possibly very rough seas, and fishing is
a secondary consideration. If you are interested, I strongly suggest you
look at these websites, they will tell you much more than I ever could about
kayaks specialized for fishing:

en.wikipedia.org/wiki/Kayak_fishing

http://www.eastcoastkayakfishing.com/

www.allkayakfishing.com/

As for launching from a beach --- it is either very difficult/impossible, or
very easy depending on the height of the surf. If the surf is very big,
forget it. If there are no waves or very little waves, it is easy. With a
kayak, you don't need a boat ramp like power boaters do, because you can
carry your kayak yourself.. Some kayaks outfitted for fishing are highly
advanced with fishfinders, electric trolling motors, live bait wells, etc,
etc. But beware --- whenever you go on the water you are taking your life
in your hands. I strongly recommend you take courses, have a waterproof
marine band VHF, and dress for the water temp, not air temp --- this usually
means buying an expensive drysuit that is as expensive as the kayak itself,
but worth it.