We have a 6mo. old baby girl

, Lilly, and my daughter who is 9 years old, is very interested in learning to show her as a Junior Handler.
Does anyone have any suggestions on classes, or how to learning showing?
She has already completed 'puppy kindergarten' with her through our local Pet store.
We are in the Portland, OR area.
We are planning to go to the Rose City Dog show this weekend to see what we can find out.
Also - I was reading APR is a good place to start; what is APR?
Thanks!