Hi!

Welcome!
Each dog is different, so it's hard to say what a puppy should weigh at 11 weeks or how long it will take to potty train. Unless you know the breeder personally you just have to rely on doing the research on the breeder and decide that, to the best of your knowledge, this is a reputable and honest person. I would want the transfer papers at the time I pick up the puppy. I don't want them to send these to me as I've heard of too many people not ever receiving them. Make sure the breeder understands that you will expect to get the papers and medical records at the time that you pick up the puppy. All agreed to statements of health, return policy, obligations to pay for treatments, etc...need to be discussed and agreed to and in writing
before you pick up the puppy. If you have any questions that aren't being answered in a clear way, then keep saying to the breeder that you are sorry, this is all so new to you, but that you just aren't clear about this, could she try one more time to explain about blah-blah-blah.
So here's hoping and praying that all works out well for you and that you will have your baby in just a few more weeks. I know it will be the longest few weeks you've every had. But use it to get stored up on sleep...because you'll need it when your puppy comes in and takes over your life.