Well the number one important thing about finding a trainer is that you have to be comfortable with their training methods. So ask at your vet, ask other dog owners in your area, get recommendations and then call the people up and ask to watch a class. All good trainers will let you watch a class.
After the class talk to the people who are taking the class and see what they say.

With the crate issue I would probably buy one that will fit her as an adult and then find a way to block off the back of it so that she doesn't have to much room at first. I would do this only because of cost issues though, crates can be exspensive!

What you are doing for the chewing sounds about right. Also try to keep inappropriate things off the ground as well. (Although I know that's hard with a toddler in the house LOL )

Here's a link to many links on all kinds of issues with puppies if you're up to some reading

http://www.uwsp.edu/psych/dog/lib-Puppy.htm