The magic key to networking?

After 'bout a weeks work, I'm still coming up short on network multiplayering. I've got a server and client, and they can connect, and even chat without problems, but if I place a moveable cube n all, they can't see eachother. So this is what I'm up to, it has to be a prefab, not an actual player, in the editor, and there have to be network view on it, and on connection it's suppose to spawn a player unit. But I can't get any of it to work, I followed some tuts after browsing in here, but they appear obsolete (2 years) and didn't work.

What am I doing wrong, what's the magic to making a player spawn in a multiplayer environment, and they actually able to see eachother, please help me out of this madness, it's so demotivating having spend so many hours on it.