XCom doesn't currently have any campaigns.
To get started: Create a New Campaign by accessing the "+ New" menu item from the top bar navigation. Or if you will be Joining a Campaign as a player, Compose a New Private Message to the GM of your intended campaign to request an invitation.
Your Obsidian Portal Plan
Well, I’ve been playing games for years, board games, CCGs, MMO, RPGs, you name it, I play it.