Converting a 12x10 Barn shed to a coop for 50 chicken's.Also meed to know how to make a 10x40 ft run.

[chickcraze]

 

[DobieLover]

As large as that shed is, it is not large enough for 50 chickens. And a 10x40-ft run is also far too small for 50 chickens. Either consider cutting your flock size down to no more than 30 or look for a bigger shed.