If your garage isnt heated just start it up in the garage and let the exhaust warm your garage and that in return will warm up your bike...
Problem solved...Next....
If you feel sleepy or nauseous get medical attention before you attempt to ride.
Used to be **** about a warmup but learned as long as the engine is not revved just take it easy for a few minutes all is good. As you have read there are lot of opinions all work you will end up with your own.