I’m away from my game for a few days but I have a small story in my head for my sim. But first I need to make sure, can you have a farm in any world beside the HoB? They currently live there but might...
You can put the animal shed and chicken coop in a lot in any world, if that's what you mean by farm :)
I would suggest putting a farm in the Windslar neighbourhood in Windenburg, as it has lots of cottages and lakes and grassy fields. Brindleton Bay could also work too - I made a little self sufficient cottage in Brindleton Bay with chickens and lots of veggie patches.