At the top. Under the eaves.None. I assume I should add some vents. How many and wear?
I might do something like this: https://www.homedepot.com/p/Master-...C-_-NavPLPHorizontal1_rr-_-NA-_-205375574-_-N
Alternatively, you could take a one inch spade bit and drill 1 inch holes at the top. 45 holes=1 square foot. Sounds like a lot, but I bet if you did two rows of six between each stud you'd greatly improve the ventilation while not making it drafty.