How to set up multiplayer?

Hey there. I have tried to read as much i can about replication and network relevance. But havent been able to find what needs to be send and what type replication should be used.

I am thinking that all the bools for when he is jumping og crouched and stuf like that, and also the pitch and yaw, for the aim offset.

But how would you do it?

Also why is it, that direction and speed is being send, but the pitch and yaw in the anim BP? Is it because they are calculated by using the movement component, which is being replicated or is it something else?