Winterizing an inboard is usually a pretty easy process and can be done by non-wrenchers like myself. There are some specific lists out there (PM me your email address and I'll email you what I have), and I have modified one of the lists specifically for my boat.
I am in California and just dry-block mine (just drain the water), but in New England you may want to put RV antifreeze in it. Ultimately, winterizing usually includes changing the oil and oil filter, perhaps changing your transmission fluid if the boat has seen enough hours since the last change (I do it at 75-100 hours), draining the block and hoses (usually requires removing drain plugs from risers and base of engine block along with disconnecting a few hoses along the raw water line), removing impeller (unless you are planning on replacing in the following spring), and many people "fog" the engine which should be done through the intake or in each spark plug hole depending on the type of engine you have (if fuel gets squirted into the intake on top of the engine you can put the fogging oil int there, too, but if it is a dry intake like with an MPI engine then you need to fog in each spark plug hole).
If you are not familiar with some of these terms, don't worry, it is really a pretty simple process and you'll get the hang of it quickly.