Long story short… I would suggest this tutorial series to you:
This is Epic’s Multiplayer Tutorial and they lead you through the whole process of creating the menu, settings and controls to get a network game basicly working, including a lobby, several different characters (which are inherited from the same parent). In Multiplayer the topic replication is a beast, just like ownership and you have to wrap your head around that also and following those videos/steps it help me for example to understand those things better. I hope that you will also find them useful.
And if you worked your way through this tutorial you can expand it in every way you like it. And in the best cast you know what those things do, so you can adjust everything on your own for the first few changes 
The next barrier is always ahead xD