The first thing you need to do is to make sure your fence is horse proof - horses have a bad habit of trying to "get out" of enclosures - be it a small paddock or a hundred acres or more. "THE GRASS IS ALWAYS GREENER ON THE OTHER SIDE OF THE FENCE"

Secondly - when you are ready to purchase your horse - you need to take a horse-wise person along with you.

Thirdly - you need to have this horse vet-checked and it should be made clear to the owner that if the vet finds a major problem that you will return the horse for a full refund of any monies you may have paid out
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PHritters