1996 201 wa - washdown and baitwell

I/o or outboard bilge located, this is a generic and maybe too simple description as i dont know your boat personally.
decisions.....
do you want separate sytstems or split?
there must be lots of info online somewhere.
basic...
you probably want a through hull pickup (with the slots pacing foreward)
you locate a spot in the rear ~30% of the hull, between keel and first strake(with access inside boat) if there is one, drill hole, install pickup with sealer,inside backing and nut and any minor fasteners.
attach a seacock valve on top of pickup, put a sea strainer on that if desired, put desired pump(centrifugal most common/innexpensive) on top or plumbed via hose near that, run hose to bait tank or to a Y valve if you are going to split system.
If you split system run one hose to bait well(equip baitwell drain with a removeable overflow tube with a coarse screen filter) you may also put a small valve on the bait tank inlet if you want to regulate flow. run other hose to washdown outlet with or without valve. run positive
wire from pump to a switch at helm or near tank, run other side of switch to a fuse or breaker, run neg ground wire from switch to nearest ground or negative bussbar. test for leaks and operation ad bait and you are go.

some people run a complete separate system for washdown and use a flex vane or diaprhragm pump for more pressure and internal automatic pressure shutoff switch. a Y valve is often istalled in washdown system so it can be a backup bait pump .this setup is more common for mcuh larger offshore boats that are out for multi days and carry $100++ +bait and cant deal with "rolled bait" 100miles offshore.
ask some other fishboat owners at your launch area or marina to see their bait systems
or even climb into a similar model at a boatshow.
systems are very common.
appologies if this isnt remotely what you need to know or if it isnt completely proffessional or bia/nmma approved.

list , through hull pcikup and hardware, marine sealer several 3m products avail.
seacock valve, strainer, pump , switch, fuse, wire and wire connectors, hose ,hose clamps, tank inlet fitting. tank overfill drain tube.
if somehow tank not drain plumbed you will need a drain fitting, a another hose and clamps ,&
a through hull fitting to run drain water overboard.

optional Y valve, aditional hose and clamps, tank inlet control valve, washdown valve. tank drain screen

anyone feel free to add to this list .(or criticise it).