I'm not sure what you're asking. What do you do? You love them to pieces!!
I know all about being new to cats, and this is a wonderful place to come. I've learned so much in the past few months that I've even amazed myself
You'll catch on quickly.
My only thought so far is the issue of using them to keep down the mice. I don't really have a problem with that, but I'm assuming this means they'll be indoor and outdoor cats? If you live in the "country" and don't have much around, I'm sure they will be very happy. Make sure they have all their vaccines and definately a rabies shot. You never know what they'll get into. I'd be afraid that a bigger animal may get them, but hopefully that won't happen.
The mice themselves can be a problem. I'd suggest keeping up with some sort of deworming pill every so often. I know a lot of cats can get all sorts of icky things from mice. Also, being outdoors a lot, fleas may be an issue. You may want to get some sort of topical flea medication. Advantage and Frontline are good for fleas, but Revolution protects against all sorts of things. Fleas, ticks, worms, even heartworm (which my cat has recently been diagnosed with).
I hope that as soon as you bring your new babies home, you'll be taking them to the vet for an all around check up and their shots. Ask anything you can think of!
Good luck with the kitties and keep us updated! (we LOVE pictures by the way)