Housebreaking your new roommate
It's no fun cleaning up a mess after a big dog like a Weimer.
Here are some tips that may help you train your new housemate and make him/her much more welcome in the house.
Remember two key words: routine and praise.
Make sure you take your pooch outside about every hour or so in the beginning to give her the opportunity to "go." Dogs adapt very well to ROUTINE. Every time she "goes" outside, give her a nice hug, a pat and even a dog biscuit or a delicious piece of meat. Speak in a soothing way and say "Goooood Girl !!!!!!!" or "Goooood Boy !!!!!!" The dog will connect with this pretty soon and may even start to "fake" a need to go out. But it works. You'll be saying, "No, girl, you really don't need to go right now. We'll wait a bit and then go outside and see." Sometimes you may have to stay outside with her a while till she goes. But this routine is what trains them. After they go, they get a treat, praise and get to run excitedly back inside to the "nest." So, as you can see with this inference, after a mistake, an extra isolation outside away from the rest of the family also lets her know that when she goes inside, there are consequences. This would be a "routine" the dog will want to avoid.
If this is not going well right away, be consistent and then decrease the area where the dog can roam inside so you can keep a closer watch. You must be vigilant during the training period and CATCH the dog DURING THE ACT. Otherwise it will not make much sense to the dog who will not relate the place of the event to what he/she did. You will also need to clean that area very well so the dog doesn't think that THAT is the place to "go."
If she ever makes a mistake, catch her IN THE ACT and scold her, even put her nose in it. But if you didn't see her do it, it is not a good idea to be too harsh as she won't connect what she did with anything bad unless it is immediate. As soon as she squats, yell "NO!!!!!" She'll know that what she's doing is bad. It's the same with throwing up. As soon as you hear the heaving sound, you can get excited and say "OUTSIDE!" and you can train a dog to run to the door to go outside to throw up. Or you can, at least, usher them to a floor instead of a carpet.
After she starts getting trained she'll get nervous when she needs to go. At first she won't know why and will run to and fro, maybe to the door and back. Or she may just go sit by the door. But it is UP TO YOU to start noticing the signs she is sending.
It would be nice if you could train her to bark at the door or scratch it. Then when you are anywhere in the house you'll know she needs out. So when you KNOW she needs to go, take her to the door and try to get her to bark, even for a dog biscuit. She might start connecting that to her routine, too. So then you'll have a dog that will go to the door, bark or scratch, and wait to get outside to "go."
With a little patience, repetition, consistency and routine, you will have your dog housebroken in no time at all.