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So, I think the topic for online play will feel more at home in this section ;).
1. Click on "Online Play". Choose a server or create a new one. That's it :).
2. As far as I remember, there are corresponding buttons for this, which open a list of created servers or a panel for creating your own.
3. It seemed to me that players are distributed by region, and if you live in Russia, you will only play with Russian players. At least, in the Conflux Orb I found yesterday, there was only Russian speech ;).
4. Click on the blue planet icon; there you can find a button for the chat. You need to create a channel (I had some problems with this in the beta, so it's easier to communicate via Skype if it's really necessary).
5. One key - one account - one nickname - one dynasty. That's how it is - strict, but fair. If you want a second nickname, buy a new game and create a new Ubisoft account.