Hi and welcome!
First of all, this all really depends on where you're going to be. In Oregon, keeping horses is much different from keeping them in Alaska.
In either case some things that you're going to need or find useful on your acreage:
-A field with good safe fencing, no wire!!! There are a lot of options currently out there. You will also want to leave a space between your fence and the neighbors.
-A smaller paddock (200X200 ish??) with a gate out and a gate to the field. This is good for introducing horses and keeping one "away" to treat an injury or something.
-1 shed per enclosure of adequate size for one (or two) more horses than you currently have.
-A hay shed. With my horses, the rule of thumb is about 1/3 of a bale, per day. For a clyde, I'd think bump that up to about 1/2 a bale each, so one bale a day = 365 bales a year *5% for spoilage/wastage. You may also consider feeding round bales in the winter, esp. in Alaska.
-You might want to add tire feeders to decrease the wastage of hay.
-A small heated barn. This is more of a creature comfort for humans. Horses don't NEED to be stabled, but it is nice to have the option in case you have to deal with a serious illness in mid winter (esp. in Alaska!). 2-3 stalls would be adequate, and a tack room!! You don't need anything for heat, just insulate it well upon building and you're good to go. When there's horses in there it will get plenty warm. I'd also like to suggest adding a good ventilation system. There are a lot of inexpensive "pre-made" barns for sale in this day and age.
-If you are just going to be driving, have somewhere to drive, perhaps the separation between yours and the neighbors property could be made wide enough to put two horses through. If you're going to be riding, you'll need an arena. Either leave the land and just fence it, or get it properly based and footed. Bad footing is worse than no footing.