Early on I try to add 4 boyar sons, 2-4 dismounted boyar sons, 3-4 druzina (spelling?) and the rest spear and HA (kazaks) of various kind. Usually I don´t add too many spear.

Later depending on money I replace druzina with Tsar Guards, add dvor cavalry (4), add dismounted dvor (at least 4).

Overall I try to use the strength of missile troops. For defending cities I add even more dismounted dvor since they are good at melee too.