I usually am not on the boards but happened to come across your post and it struck a cord in me. First I want to agree with what others have said, you will be inundated with information. I want to highly suggest you use a tape recorder, or digital recorder when you go to the doctor appointments. That also may help your dad process all the information and make the decision that is right for him.
As a caregiver you will want to do all you can for your dad. Remember to try to take time for you to process, and breathe.
Sending you many positive thoughts for this journey.