After BW I went TW - Pottery and quickly got a settler out to establish control of the eastern pass between China and Viking land, and to grab Gold and Copper (and deny Copper to Ragnar).
If I'd known about the Wheat in the mountains I would have settled 1N, but what can you do. It's an OK city with a bunch of farms, and I later got a nice mountain city with the Wheat, Sheep, Fur and Deer all in the first ring.
Having Copper so early made me think of taking Ragnar out with Axes, but I had some barb issues to take care of and I suffered a major setback, losing an Axe on a forested hill when a barb Archer attacked it (maybe it was just a bare hill...) I also didn't want to miss the western Copper/Gold site, which I settled T58.

Oh yeah, I had a close run-in with the barbs over there! I managed to get a second warrior there in time to save the city, and Mansa even came to my rescue, defending my city with his Skirmisher!

Thanks Manny!
That gave me enough room to end up expanding to six cities (with room for a seventh filler city in the middle)
I beat all the Immortal AIs except Mansa to Alphabet and traded it for IW, Math and Masonry. I knew Ragnar would be an issue sooner or later, shut up in his barren coast with only me to attack, so I decided to deal with him on my own terms and teched Construction.
I had given him enough time to hook up his northern Iron, so he already had a little bit of a stack waiting for me in his border town, but it was nothing 8 cats and 8 swords couldn't handle. After that the war was pretty smooth sailing, though he did manage to snipe my beautiful city of Guangzhou with a couple of chariots that struck from Malinese land. I had some Spears in the area and was able to retake it the next turn, but that's not very pro play on my part.
I chased him to his last two tundra cities and called for a cease fire since he was threatening Chengdu with a credible stack. I probably should have just taken peace and gotten whatever tech he can give me, because I want Elizabeth's cities yesterday -- she has some nice wonders including TGL, and she's hated by all the world for being the only Buddhist. Mansa, Bull, and Ragnar are Jewish and I joined Sal and Cathy in the Hindu bloc. I'm planning on heading straight for Engineering next.
It feels like this game is going to be constant war. Domination seems like the fastest and easiest way to win. I'm thinking of taking Steel with Liberalism (if possible; I'm still teching really well despite fighting and expanding, and right now I have a monopoly on Paper) and that might be enough, I might finish the last AIs with Cannons and Elephants or something.
All in all though I feel very good about my position. I'm still new to Immortal but it's felt like Prince this game. Also I'm swimming in happiness resources. Mansa must have given SB Calendar really early and I think I've been able to trade for every happiness resource before Whale. Markets and Forges are each worth +3 for me. I've been whipping a lot but I'd like to start growing Beijing more.