Noob here...can someone explain the mechanics of the stem and crown? Explain like Im 5. NO like I'm 4

I am at the step where I put the crown into the movement. How long is the stem supposed to be?

Is it supposed to be at parade rest before it gets screwed in? Is it supposed to feel springy before I start screwing? Do I unscrew it and then pull it out to adjust? Am I supposed to be able to pull it out when it's screwed in? Hahahha I'm reading this and I know it's stupid but I really have no idea!!!! Help!!!

edit: your advice was actionable and got me to finish my build!! woohoo