I would immediately finish off the Turks and Byz but that's only my playing style.

getting the Byz to entangle themselves in the steppes is a good idea as they then leave Const. virtually unguarded.

Nizaris are awesome with one of highest attack/charge combos in the game and can outduel just about any missile unit.

however, their defense is trash so armor them up or you'll regret it.

spamming imams is very effective and makes your jihads really good.

silver armored ghazis in Const. are also almost a must if you want to use those crazies.