So i've been playing this with different groups of friends and the more I play, the more I have questions that I cant really find answers to so im hoping someone here can help me out.

-when preforming skill tests and you want to use cards to add to the value, do you add them before you pull from the chaos bag or can you also do it after?

-If i am engaged with an enemy and i want to attack them, am i able to play cards like Clean them out or like Monster Slayer that can affect the situation without getting hit with an Attack of Opportunity or do i still get hit by it?

if an enemy who isnt engaged with an investigator becomes engaged during the enemy phase, do they also get to attack?