Hi! I'm very new to chicken keeping. We found a really old chicken coop after we bought our property. It hasn't been used well over 10 years but still structurally sound. Needs a bit of tlc. While cleaning out the straw, I noticed a strong musty/moldy smell. It was really dusty too. Please advise what I should do to thoroughly clean it out before it's safe to put chickens in there. Also, should I use straw or pine shavings for nests and floors. Thank you.