For my m/m campaign;
1st turn - Gather troops outside of Jerusalum (sp, whatever

) and Tortosa. And train as many catapults/Trebs as poss. Send your princess/diplomat to Seljuks straight away.
2nd turn - Assault Gaza and Antioch, take both.
3rd turn - Take Aleppo and Damietta (use a boat for Damietta)
Basically, just bribe the balls off of the Seljuks to keep your relations up and try to get alliance with the Byzantines. After 3 turns, if all has gone well you've removed the Fatimids 3 castles and 1 major city. Now you can move on Damascus (thus removing one front from your war), and crusade on Cairo/Alexandria. Essentially, job done
EDIT:
Turn 4 and 13 respectively.