Where to start with multiplayer game

Hi,
I'm a programmer with lots of experience in custom engines - mostly graphics programming. I want to finally try to make a game based on the idea I've had long time ago. I don't know Unity but that's not a problem. There are lots of tutorials.
The problem is that I know very little about network programming and the question is where should I start?
The game is not Clash Royale clone but I think it will have very similar requirements in terms of networking code. Short 1x1 or 2x2 matches where users are selecting their units and sending them into battles - after that they have no control over them.
How would I handle this? How and where should I host a server? Do I need some third party libraries or unity's built-in networking features are enough?

Cheers and thanks for all the answers

 

https://www.youtube.com/results?search_query=multiplayer+game+tutorial+unity

Don't say I never do anything to help you guys!

 

You should definitely familiarize yourself with Unity (and C#, if you haven't already) first before worrying about and tackling something advanced like multiplayer. It's never a good idea to start with a multiplayer game as a beginner.

Since you're mainly into graphics programming, maybe only worry about that part and leave multiplayer to someone else?
.

 

Maybe this will help as a starting point?
https://docs.unity3d.com/Manual/UNet.html

 

Yeah, I know C#, I will familiarize with Unity first a bit but the advice I got was to start looking into multiplayer as soon as possible and I think that it makes sense.

I want to make the first prototype by myself. I don't know if my idea for the game will work out. I kind of assumed it won't be that hard in Unity.

It looks like Photon Engine is quite popular and should be enough for what I'm trying to achieve.