I am in a three way war with Venice, Byzantines and Russia, Poles joined the fun but were beaten back and ask for peace. War is indeed inevitable, you need a sizable army for each of your neighbours.

Allience means nothing, I was allied with all of those four factions before they attacked.

Money is tight, you have some to develop but as soon as you got in war you will be dancing on the edge (unless you can take some rich provinces, unfortunately I let the Venitians to took Zagreb).

Council of nobles gives you sensible missions, they adviced me to take Bucharest, Iasa, Kiev and Kaffa in this order but it will lead to an overextension of your armed forces.

All in all very difficult situation: 2 of my neighbours are top 5 nations (Venice and Byzantines) all of your neighbours will attack you soon as they see that you dont have the troops to defend your cities, you are seriously overextended, bogged down fending of the attacks fo your neighbours ... perhaps sacking of a rich medditerinian town might help, or taking Rhodes but I have a crappy crusader army ... well, we will see ...