Chicken and duck questions...

Okay all of you poultry experts...A couple questions for you...

1-Do pullet's only go into the nesting boxes when they are ready to lay??? Our's use the top which is sloped as a stepping stone to their roost...they fly up to the top of the nesting boxes and then fly over to the roosting bars...

2-Do you put your feeding trough outside of the coop or leave it inside??? I have our's inside the coop...but was wondering if I should keep it outside the coop during the day versus inside the coop???

3-Is there a problem having more than one rooster??? Not that I plan to get another one, but just wonder if they would fight if there was more than one???

4-Do ducks roost or do they stay on the floor of the coop???

5-Do ducks use a nesting box like chickens???