Same here, bit late to this thread. The advice you have been given is spot on, learn all about weights and loading, If you arent used to towing, you will find that very often, the end of your journey is often down narrow lanes, and remember, your caravan is wider than your car. If you are haing to squeeze into the hedge, allow extra room for the caravan, dont base it on your cars width.
When you go off on your first trip, learn then about the things you need to carry, you can always buy there anything you havent got and need. Its far to easy to hit the nearest accessory shop and buy everything that looks interesting. Chances are most of it will finish up at the back of your garage.
One of the most important bits of kit is a £1 spirit level.