we'd suggest some weekend camping over the course of the summer, or as soon as you can. That'll give you an idea of what tent camping is all about, and you can develop some sort of system for yourselves for pitching and breaking camp. You'll also have the opportunity to perfect your camp cooking skills, learn how to best pack your car for easy loading and unloading, etc.
And although this may sound strange, we encourage you to camp one weekend in the rain. Because you have no control over the weather on your adventure, so you might as well get a taste of what it's like before you head out on the road. It'll also help you learn how to best arrange your campsite for inclement weather.
Here's something to look into as well ... dehydrating some of your own meals. It's pretty easy, and there are several good guides that will help you design some great meals. Or if you're not into doing the dehydrating thing yourself, try something like this:
http://www.hawkvittles.com/ These meals put the commercially made products (MountainHouse, etc.) to shame.
Enjoy your time camping. There are also national forest campgrounds that are very inexpensive, or free, although they don't have much in the way of facilities (like flush toilets ... it'll be chem toilets or pit toilets). Just check to see if it's hunting season in the area.
We're backpackers so we don't car camp much. But the idea is basically the same, and it's always a good idea to give yourselves a few test runs with your equipment before hitting the road!