How far you have to go with winterizing really depends on where you live. Southern states don't have to contend with the long freezing periods like Minnesota. As far as flushing, your owners manual should cover that pretty good. I use Startron as a fuel stabilizer. Just put some in a fuel tank before flushing so it will get through the system. Store it with a full tank to keep moisture at bay. Lube all pivot points with marine grease or a good silicone spray. Some people use fogging oil, but you can just put a teaspoon of marvels mystery oil, ATF, or 2 stroke oil if you have that laying around in each cyl. Marvels or atf would be my choice.