Get a can of silicone spray and hose the clean out plugs down liberally. This will not only preserve the rubber, but also makes installing and removing the plugs super easy. In regards to clean out plugs, get a J blade type of knife, and a utility razor knife with standard and hooked type of blades to clear any lines or other obstructions from the pumps. Also go to the FAQ section and look up clearing obstructions.
As
@OCMD stated, if you can get your hands on non ethanol fuel run it. I run non ethanol fuel and I put a stabilizer in the fuel as the end of the season approaches. The proper way to treat fuel is to add the stabilizer to the tank and then fill the tank up, then go for a ride in your boat to thoroughly mix the stabilizer and run it through the system. Especially true if you if your only option is ethanol laced fuel.
There’s a lot of discussion on fogging of the engine. I personally do not fog my engine, but my boat stays in a heated shop through the months of solid water.
Trickle chargers are a thing of a long by gone era. Get a battery conditioner, NOCO, PULSETECH, MinnKota etc.. mount on your boat and plug it in each time you return from an outing and your batteries will be fully charged for the next outing. The difference between a trickle charger and a battery maintainer is that a trickle charger delivers a constant low amperage charge that will eventually boil off the electrolyte and destroy your battery. A battery maintainer is a smart charger and will be able to provide a specific charge to the battery type, flooded, AGM etc. Said charger will give a good bulk charge, a maintenance charge/float, as well as doing regular equalizing charge on flooded batteries. Spend the money and a little time to install this charger with the plug installed in the boat and you will not have battery issues.
And most importantly if you have not done so already, RTM, or read the manual. Blowing out the excess water from the water locks aka mufflers is important. The rest of the boat will drain down. Do you live in an area that freezes?
Do you have the factory shipping cover? If not get a cover and put it on the boat.