'ello & welcome
Chicken wire fencing is the best as it is small enough (hole size) to keep out anything that shouldn't be in there. Bury it as far into the ground as you can (6-8 inches) to limit foxes burrowing under & support it with good fence posts.
As for arcs/hen houses, have a look on the widdlieweb as there are loads of different ones out there. It depends on what you want really as all proprietry ones are much of a muchness in terms of perches, nest boxes etc. I bought mine from Flytesofancy but I know that Other folks have used Forsham. 2 basic types, ones lower to the ground with the run & house at the same level & those that have a run with a ladder access to the perches & nest boxes - these are easier to clean as they are more at waist level so don't need you to crouch down!
Enjoy!!