You start by selecting a deck nation, and played against other AI nations to unlock other decks/nations. AI was easy to win against. Able to play against human opponents and that was good mix of opponents.
Please note you cannot directly speak to your opponent. You do have a selection of preset messages, and looks like you can edit them as well. Although I've not tried.
The connection to online opponents works well, so far I had not one game crashing.
You can also send friends invites.