Because these pups are a mix, some of your questions are going to be very difficult to answer.
For example, #1: How much do they shed?
Well a sheltie tends to shed a lot while poodles shed very little, practically not at all...
Your best bet is to actually see the pups. Those that are double coated (like a sheltie) are going to shed more than those with a coat more like a poodle.
Also be aware that both breed need regular grooming. Because of the double coat Shelties need regular brushing to remove loose fur and prevent matting. Poodles on the other hand need to be clipped by a groomer (unless you know how to do it yourself) quite often. My friend takes her Standard in every 6 weeks. Grooming needs are going to be different for each pup and be dependent on coat type!
#2: IME shelties tend to be pretty vocal. As far as poodles, all of the standards I have met/know have been pretty quiet. I have not met many minis or toys.
However barking is more of a training issue. Any dog can be taught not to bark all of the time. If you find yourself with a big barker Kikopup has a whole series of training videos about barking on her youtube channel. Here is the link to the first video in the seires. http://www.youtube.com/watch?v=Jp_l9C1yT…
They are all free and of course fabulous!
#3: They probably will need a decent amount of exercise. I would say that they are not likely to need as much exercise as Labs, Huskies, Pointers, etc. but are not going to be as laid back as an English Bulldog or Greyhound. Be prepared to take a long daily walk each day as well as play a game such as fetch.
#4: They shouldn't be too hard to house train as shelties are quite smart and poodles are one of the most intelligent breeds. Also IME most of the time people who are having a hard time house training are doing something incorrectly. It is usually not the dog's fault.
If you want to read up on house training go here:
Lots of really good advice! Everything you will need to do to housetrain a puppy is laid out for you. And again it is free!
#5: Just keep in mind that these are mixed breed puppies. Read up on both shelties and poodles. But even then understand that there no guarantees when it comes to mixed breeds. You just never know what traits are going to pop up!