1: How to you ready an archer's arrow?It's moved above the Hero Board. See the Archer Guide Card in the 1.1 release.
Do you remain it in the slot or removed and place a side?
2: How do you move Big figures? Figures with huge tilesOne space at a time, just like any other figure?
3: Can enemy move through their friendly units?That's listed on page 36 of the main rulebook.
4: What is the effect of prone? I searched the rule book cant find itThat's listed on page 15 of the main rulebook.