Looking for quick Mercruiser 350 MPI winterization routine

I am planning on staying out year round this year. I keep my boat in a covered spot without access to electricity. Essentially, just a spot outside with a roof and no walls.

Anyways, I live near Seattle and I want to do a quick winterization on my 350 MPI mercruiser (98 Tige 2200V) with a heater and a shower every time I pull it out during the colder months. Anybody have a quick winterization procedure they go through?

Right now I am thinking something along the lines of:

1) Disconnect and drain shower system (I never use it anyways)
2) Remove 5 (I think there are 5) blue drain plugs and let the water drain...put them back in.
3) Start motor and suck up antifreeze via Flush-Pro system
4) Done

Do I need to do anything else?
Will sucking antifreeze through the Flush Pro system (or a fake a lake with hose into a bucket of antifreeze) for a few seconds be enough to keep the block, vdrive, tranny and heater from freezing?
Approx how much antifreeze will I need each time I do this?
Any recs on an type of antifreeze for this?

Thanks

Bakes

PS--> If anyone has a link to a web page that has the "standard" winderization routine for a MPI Mercruiser V drive that would be great

Later

Bakes