The walks will tire her out, and she should hopefully be calmer! We have also had our first walkie. In fact, I was in the park this morning for our first off-lead walk. It is amazing - 20 mins of running up and down after her toy and she is ready for home.
I find that I worry about something one week, and by the time I have asked for advice, the problem has solved itself.
As long as the biting is being worked on, then with a little patience, I reckon all should be well.. Especially if you are attending puppy classes - you will have a wealth of people in the same boat to talk to.