Based on your half time, your easy days should be 8-8:30 pace, and your very easy days could be as much as a minute per mile slower. The easier your easy days are, the better you recover and the faster you can go on hard days.
Absolutely; I've been running slightly faster than 8:00 on normal easy days, and 8:15-8:30 on super easy days. I think its my biggest problem in training, and it'll be the toughest thing for me to change.