IIRC, Writing has 3 optional pre-reqs, Priesthood, Animal Husbandry and Pottery. You only need one of them for Writing but having 2 (and then 3) reduces the research cost of Writing.
I almost wasted turns on Pottery. I did spend turns on Agriculture and The Wheel before going to Priesthood to start the Oracle, but at least they were integral in the strategy.
I got off to a great start with Asoka. I basically ripped off ArcadicGamer's strategy. Got all religions but Buddhism (Saladin and Darius -- Saladin founded and got to Darius before me), eventually missed Taoism by a few turns but I had spread my AP religion to everyone by then. I just saved for the night at 1645-ish AD, still no winning vote, I haven't been able to maintain consistent favorable voters or opponents. In trying to even out the religion spread to get more votes, I end up creating a new opponent in the voting. It feels oddly like trying to even out sideburns and ending up bald.
Genghis and Hatty are Friendly, and Genghis would be a great opponent except Hatty is his vassal and therefore votes for him if he's a candidate. I wasn't able to muster enough support in going against him, so I beefed up Caesar a bit, now he's my opponent. Genghis and Hatty cast their votes for me, Darius and Saladin abstain, and then there's stupid Hannibal. I spread Confucianism to him first, but he got a whiff of Christianity via trade route spread to one of his new cities and switched to that. Despite having Confucianism in every other city, and Christianity in only the one, he would not switch back -- once he'd switched, he didn't like me enough. I couldn't keep up with his research with my measly 3 cities (one a frantic grab for iron when JC attacked), so I had little to offer to butter him up. I even gave him my lone gold resource (not like I need the happiness).
Invading Darius now to see if I can vassalize him. If that doesn't do it I'll go after Hannibal, but I think I've lost all hope of a good finish date by now. Still, I'm pretty happy with how it's played out, being my first ever Monarch game.