Hi and welcome Noelle.
Wow, 3 foot long nestbox. That sure is a looooooong one!
Mine are generally no bigger than 2ft deep and aprox 30 x 30 cm.
I am not sure when your breeding season is over there, so can't help too much on that one.
The male will generally do his love dance of heart shaped wings to woo her and he will feed her. The hen will also begin to spend a bit of time in the nest box getting it just right to start her family.
