Great advice from PP. I am 46 days into tracking, and have found that certain foods I have to avoid, some are almost like free foods, and taking a long walk will drop my bgl fast! Also remember, if you start getting high readings with foods that normally wouldn't, you need to contact your Dr asap. HOrmones in pregnancy are what cause GD and they can't always be controlled by diet and excercise. Most can though. You do not have to obstain from all sweets or foods you love, just budget for what you want. For example - one of my meals was a chicken, avocado wrap with some other fixins that were carb-free. The wrap was my carb, there were 22g in each wrap. I had 1 stuffed to the brim with good healthy food, then I had a dark chocolate and peanut butter "smore" (no marshmallow). That still stayed within the 60 carbs I can consume at dinner time while not spiking my bgl after 2 hrs. I don't do this a lot, actually only once in a while, but it helps with those cravings!! I have also found eating a well-balanced diet has helped keep all the cravings at bay.
And a great side-effect of GD - very little weight gain!!! Seriously, packing in the complex carbs and fibers to help digest the sugar is a sure fire way to keep the weight from piling on.
Hope some of that helps, just remember that everyone is different and that this is totally managable, one way or another!