nutrition help for a first timer

A rough rule-of-thumb is probably about 250-350 cal/hr on the bike and about 100-200 cal/hr on the run.  That includes any calories you take in drinks (like Heed or Gatorade).  Larger bodies generally skew up and smaller down on the scale, but there is wide variablity and much of it is simply related to what your body is able to process smoothly while working at your race effort.  That's why it's a good idea to do some trialing during training--ideally, at or above your race effort for longer workouts.

If your rides aren't that long, there's no need to use Recoverite or any other recovery drink (except maybe for convenience).  Eat a snack when you are done.

Almost all your calories should be from carbs.  You don't need any fats or proteins.

Agree with JK... not just because of his great initials either.  As a reminder, it's better to do too little than too much, generally.  But just a personal anecdote... I consume WAY more than those numbers on my long course efforts.  About 400/hr on the bike and 250-300 on the run.  I'd recommend starting around the numbers he posted, and then trying to do a little more and see how you react.  Over time, if you pay attention, you'll develop a sense for what you can do.

Hint - it depends in part on how hard you are going, and on the environmental conditions.

I know there are several ways to figure out your needs on the bike and run. You can find a link to calcualting bike and run calories at the bottom of the page http://www.infinitnutrition.us/information/#general-info; I know nothing is an exact science, but it gives you a general idea.

Train with what you plan to  use on race day, as I am sure that is advice that has already been given. 

Have fun at your HIM