I've been waiting for a similar response in a post I made in the "Technical Q&A" forum. 22 views but not one response.
Do you currently have synthetic fluid in your tranny?
I'm thinking you will probably need 4-5 quarts. The tranny takes 10 when it's dry but when changing the oil most of it will remain in the torque converter.
As for the filter - definately change it! (how well do you trust your tranny???)
There's actually 2 filters. One in the tranny (oil pan) and there should be one on the bottom of the radiator on the driver's side. I'm changing my tranny oil soon and I'm replacing both filters.