Sheep and goats both do better in pairs or more, as they are herd animals. There are many different breeds of sheep and goats, I suggest you have at least 3 kinds of each, and with sheep, make sure you select some hair sheep, such as Barbado or Katahdin, as they are a novelty most people have not even heard of. With goats, you will want some pygmy as well as the larger Boer goats. Many petting farms have at least four or more of each species, and one breeding male, as such they always have young animals in the spring and can keep some, and sell others. As I said before, bottle fed animals are more friendly so you should select these as your starting animals.
You will need some larger animals too, such as horses, donkeys and/or cattle. To save space, and add a "cute" factor, I suggest you look for miniature horses, donkeys and cattle. Stay away from stallions, as they often bite. You will also want a llama or alpaca, both of which make excellent guard animals for the sheep or goats. Contrary to popular belief, not all llamas or alpacas spit, a friendly animal will not spit unless it feels threated.
Other animals should be considered depending on what is in your area.
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People
You will be mostly catering to families, so you need to be very kid friendly as well as able to communicate to adults. You will need to establish boundaries about time of the visit and where people can and cannot go. You will need to make sure you are able to enforce these boundaries. You must be able to say to people "I am sorry, but you will have to control your child or I will have to ask you to leave.". Make sure you have good signs indicating what areas are off limits, I suggest you do not allow people to wander on their own, but should stick together with you.
You may find that people ask you to do more than you thought you would be doing, as such they may want you to host Birthday Parties, or bring your animals to a school for a visit. Consider what you will and will not do, and the legalities involved.
You should have some seating areas, even a picnic table will do. Planting an attractive yard is something worth considering too, as over all presentation.
Good Luck with your venture, please read some of my other animal links for help with care on the various animals suggested in this article.
