This is my first time winterizing . Just want to double check that my understanding of the motor draining is correct. '18 mojo

Remove all blue labeled drain points (5)
What would/could happen if this is all I did?

How is the heater handled?
Do I need to pull hoses off?

I know most pump RV antifreeze through. I have a fake a lake setup.
How is the antifreeze ran through using this method? Hook hose to spigot on bucket onto fake a lake and start the engine? 5 gallons enough?

The garden hose connection with the blue sticker
What is this?
Can I make a gravity drain bucket and attach to it to run antifreeze.
through instead of fake a lake under the boat?
Which side would I hook to?

Ive read through many winterizing forums and I think I have an understanding of everything else that needs to be done. TIA!