Part 2: Early Game
With such a promising BFC and conveniently starting on a riverside PH, I went ahead and settled in place.
I teched
Pottery first (not AH as TMIT said), to cottage my 2 FP's right away. Next was Animal Husbandry (for the pigs, as well as sheep to the north), then Mining -> BW. After this I would go Writing -> Math.
Why Math instead of Aesthetics? Well, although the AI's usually research it early, they tend to be reluctant to trade it for a long while - often too long for me to be able to rely on a Math trade for my strategy. Since I'm likely to have to self tech it, I'd rather just get it early to boost my forest chops. The plan is to trade for (part of) Alpha, hopefully with Math.
I see some very nice land in the vicinity of my capital and two obvious city sites that I absolutely must get (to the north and south east). Since the AI are to the south, I settle the southeastern site first.
The situation in 2160 BC:
At this point I have two workers out and a third on the way. Luckily I have copper in my capital's BFC, so I hook it up and make a single axeman which will hopefully be enough for barb defense. My capital will build a settler next for the northern city, followed by a library for the scientists.
1560 BC:
There my capital is working on the first scientist while putting out my fourth worker. Edirne is building a library, because I intend to grow my second scientist there. But I actually get my first GS before Edirne's library was complete, so I just go ahead and have Istanbul grow another GS. If I had anticipated this I might not have built the lib in Edirne at all, though I suppose the research boost helps a bit.
I get Math a turn later and go for Metal Casting next. I know I will definitely need to self-tech that one, and I like to be able to build Forges early, so that I'll have that bit of infrastructure ready once I bulb the key techs.
675 BC I get my second GS:
I had founded my fourth city, Bursa, the turn before, next to a FP and some gold to the south. In retrospect it may not have been worthwhile as it was too late to contribute anything to my war preparation. But I found myself with some excess hammers (which perhaps should have become 2 axemen) and figured it would add enough commerce to improve my research a bit.
At this point I'm about half done building forges in my three main cities. I'm teching Alphabet, hoping to trade Math for the rest of it. But the AI's don't value Math much at this point, so I end up having to self-tech most of Alpha. I work on Aesthetics while waiting for a chance for an Alpha trade but anyway by 575 BC I have both of them, allowing me to bulb Machinery. I trade Aesth and Alpha around to backfill my techs, while moving on to research Masonry -> Construction -> Engineering bulb. I also need to make sure to get Monarchy through trades, so that I can start going for Feudalism asap after Engineering.
Around that time I also bribe Mansa Musa on Bismarck and get some trade blockades going as well. With this I'm trying to slow down AI tech trading, to buy me more time to kill them before they get too advanced.
While researching Construction I don't want to whip much, in order to keep my tech rate up. But I get plenty of chopping done, so the Crossbows start streaming out. 375 BC I finally get Engineering and at that point I start whipping like mad (and continue to do so most of the game). By 275 BC my invasion force is ready.
It takes me a while to decide who to attack. Bismarck is the most natural target as he's closest and already at war with both Shaka and Mansa Musa. I also like his land. I really want to finish MM off fast though, and since he's teching Feudalism I'm worried he might vassal Bismarck before I do, so I'm very tempted to attack him first. But MM has skirmishers (and soon longbows) while Bismarck only has archers. So I go for Bismarck...
275 BC, army poised for the attack:
Attached the 275 BC save in case anyone would like a look.