I would split my macros across three meals if this is your approach.
Dr Sears says at about 45 minutes of intense exercise, cortisol levels begin to elevate beyond where you'd want them. If your workout significantly longer, consider splitting it up to twice a day. For instance, I do significant amounts of aerobic training, strength training , usually two of those on any given day, except for one rest day a week with no exercise. Keeping those cortisol levels in mind, I make sure not to do those the two daily workouts back to back.
The best way to begin is to put your stats into the body fat calculator and go with your recommended daily protein requirement/block requirement, equally balanced. It will take your activity level into consderation when calculating your recommendations. Give it a little time to let your body adjustto the Zone before you change your balance. Don't try to judge hunger based on the first meal or two, because it can take up to 4 day of consistently eating Zone balanced meals and snacks in order to lower insulin levels into the Zone.
You didn't mention fish oil supplementation, I believe it is one of most important of the basics of the Zone.