Short version:
I favour WC to start with
Long version:
I'm probably going into too much detail here (I am not talking to n00bs, I know
), but it helps organizing my mind.
Warrior code: no-one starts with it, so has a decent chance of having some trade value. Good for protection against barbs and/or early attacks. Opens possibilities for an early attack on our opponent. Dead end tech unless we favour monarchy because with our UU, HBR is not of much use (assuming we find iron).
Mysticism: almost guaranteed to be of trade value, but only useful for beelining to monarchy.
Alphabet: We can forget about the slingshot or even philo first, but the earlier we send out a curragh to the other continent, the better. The opponents there will likely be more willing to trade! Should be a high research priority.
Bronze working: two opponents start with it, so one will be on the other continent. We might want to hold off until after alphabet while reseaching other techs that give us good trade value.
One problem is that if we start with alphabet, and contact the other continent, we will probably want to have something decent to trade with first (CB will not get us a tech I fear). So there is some time, which we should use for researching higher value techs. Alphabet is a priority, but not the highest priority.
Since we are bound to find one opponent on the other continent with BW eventually, I am reluctant to go for it.
This leaves WC or Myst. Since we are forced into the lower part of the tech tree, I say we go for monarchy. Combined with the short anarchy, we might really profit from an early escape out of despotism. Hence, we will probably research both WC and Myst anyway. WC is to be preferred as the first choice for it will enable us to protect ourselves.
So my basic scheme would be to start with WC, then beeline to monarchy except for researching alphabet somewhere along the way.