re: 1/2 or 3/4 acre pond?

that's just too small, not enough pond to support decent levels of eating size populations in it.

your fish will be small and very stunted growth.

you sould go with at least a 2 acre pond for what you want and make it 30 ft deep mostly then build rock pile reefs as well as some huge sunken tree stumps out in the middle. these aren't for you to fish but to create breeding habitat and sanctuaries for fish to hide unmolested and grow really big.

don't forget you need a "seed pond" nursery area for baitfish to live so it has a self sustaining feed supply. grass shrimp, crawfish, glass minnows, shad.

you almost need to think of the smaller "seed" pond as its own separate pond that needs to be a great breeding ground to stay full of everything those other fish in the big pond will like to eat. lastly separate the two ponds with a wire fence to protect the small fish from being eaten inside the "seed" pond area.

lastly you need to think about weed control, at some point it will have a weed problem so you might want to put a carp or two in there, but not too many or they will eat too much grass since you want a certain level of overgrown grass banks.

and put some crappie in there, don't want to forget about stocking those guys in it. hell if it was me I would just stock it with crappie and nothing else.

lastly, you have to keep removing fish at sustainable levels or it gets too overpopulated and the fish stop growing as big so you need a plan for removing "x" amount of each species of small to medium sized fish each month to keep a health fish population going

here is a good website to help you with your pond, take your time and plan it correctly. once its done, its too late to change anything. LINK