lycialive, we were all inexperienced at one time. The main thing you need to remember is to buy a trailer with good customer service and that will take care of you after you've bought the trailer.
Some of the brands recommended are very heavy, requiring more than a one ton truck to safely tow.
You asked about boondocking. That is camping with few if any amenities like power and water. Many boondockers rely on a generator solar or other methods to exist and bring in their own water. We don't do it, but some like it.
2011 Heartland Landmark Grand Canyon