When i play as turks, i always take loads of horse archers, as they are simply the most fun unit type in the game.... ghazi are okay for campaign but i prefer to use more solid unit types - spears etc., ghazi's have a nasty habit of dying in large numbers even when they're winning... If you do use gahzis make sure you target weakly armoured units first to chain, and try to flank with their pace, also watch out for cav

i would notmally ally with the armenians first (a costly battle early on against multiple princes and a king doesnt sound too fun) and concentrate on dealing with the egyptians, do your rules include the use of agents against other muslim factions?