Making custom animation for different mob actions

Hello everyone! I was planning to make a mob, that have an animation set of 5 animations, some of wich I had problems with.
The main problem is that I don't understand ho playing condition works, so every procedure that I make for animation just don't appear in the "Playing condition" tab.
I wanted to create an attack animation, animation when rightclicked with specific item in hand and idle animation with a chance of playing.
I would be very grateful, if someone could help me understand how "Playing condition" tab works, or to implement custom animations to specific action.