Leather and oil are valuable throughout the game. Camels and sheep are attainable early on, though maintaining them can be a bit of a pain. Sheep can be found scattered around the countryside in grassy areas. They’re very cute and very heavy. You can attempt to slaughter an unrestrained sheep, though your odds of success are extremely low. Depending on your talent points, you can probably carry one or two back home. They do not fit in boxes, so you’re stuck carrying them until you build or borrow a pen. Once a sheep is housed, you can keep it as a breeder or easily slaughter it for resources. Most regions will have some public sheep pens available for slaughtering.
Sheep eat onions, which means you’ll need onion seeds to grow a steady supply of food. There are a few ways to get them. 1) Getting lucky at a University of Worship (each one in your faction’s territory will gift you six seeds, which might not be onion), 2) Trading for one, usually seed for seed, or 3) Completing the “Home for a Sheep” task list, which will award you a single seed upon completion. There’s a 4th way, since seeds are theoretically reproducible, but players are still puzzling that one out. If you fail to keep your sheep sufficiently well fed, they can contract Sheep Pox, which is highly contagious and only curable with a high level of animal husbandry. Your neighbours will be unhappy with you if you cause an outbreak close enough to infect their livestock, so take care.
Camels are sneakier than sheep. To acquire one, you need to build a Dromedary Pen and fill the manger with straw. Each night, a single camel invisibly prowls the area for the open pen with the most straw, where it will settle, eating every scrap of food. To lure in a camel, you’re competing with everyone else in your area to have the most tempting Dromedary Pen. You can catch as many camels as you like, though gathering that much straw is challenging. Close the door to stop luring new camels.