Hi Finleyfreyaseth, and welcome to the Forum.
If you buy a second hand wooden coop, be extremely careful you're not importing redmite with it. We've had stories on here recently of people who didn't realise that their lovely-looking secondhand coops were actually riddled with redmite and they had to spend a lot of time and also a fortune on treatments, and in one case finally burnt the coop and bought a new one instead. Total waste of money! Also, once you have redmite on your premises, it's there for good, and you always have to be on the lookout and control it. If you are a new keeper, it's worth trying to retain your mite-free status for as long as possible.
Not saying this is always the case, you'd be fine buying from someone genuine and knowledgeable like Foxy, but many people get fed up with keeping hens, neglect them to some extent, and then don't even realise they've got redmite in the coop they're trying to sell. Or they do know but don't own up to it - buyer beware! If you can get hold of a second hand plastic coop the risk is less because these have fewer nooks and crannies for mites and can be taken apart and thoroughly cleaned up in any case.