Treud na Mara's advice is good - take your time and think carefully. It's all too easy to think "oh I'll have a few sheep, and some cows, and a couple of goats, and a handful of pigs and....." I would advise getting just one type of livestock, and hens are a good one to start with, just while you find your feet and settle in with your horses. Stocking rates are important and easily misjudged when you are new to it all. Also, smallholding is far more work than you think it's going to be, and every job takes longer than you expect, and you get more tired than you think is reasonable.
As you add in a couple more types of livestock, or decide to stick with what you have, you will learn about those animals and their needs, feeding them, housing them and possibly slaughtering them. If you get several types at once you will know a little about everything but not a whole lots about them all.
As you settle in you will get to know local people, local etiquette, local conditions, local breeds, where the slaughterhouse and feed store are and establish yourself with a good vet practice. Some folk I know have a different vet for their horses from the one for their livestock, and even again a different one for their pets. We are lucky to use the same one (and we don't have horses, much though I would love to)
Forget about holidays in the sun, and long lies in the morning.