What about getting in an expert to check the house before you move in to look for problem areas where the mice are nesting and gaining entry to the interior of the house? It might be an expensive upfront cost, but at least you will know how bad the problem is. You can get them to remove as many of the mice that are already living there as they can. Being a farm though, its going to be an ongoing issue and the process of renovating might even bring more in.
As the others have said, in the meantime and at the very least you need to stop them getting in, so sealing around doors is essential, blocking every single hole you can find even if its small and then once you've blocked their entry to the house you can set multiple traps everywhere throughout the house to reduce the ones you have. You also need to set traps in the roof cavity because they like to chew on wooden beams which can be costly to replace if they do too much damage.
we use steel wool to plug up the holes too, you can get it from the hardware shop (without soap on them!). We also have a cat and two dogs and we encourage the bobtails to hang around too. I also vacuum daily and use mothballs as well.
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