Firs of all, Welcome.
As for the trailer? Personally for a first time buyer, start a bit older. Remember these things are a depreciating asset. Meaning it will be worth less than you will owe on it for most of it's life. So start your search for a trailer in the $10,000. or less range as a first timer. Second thing to consider is what do you have to tow it with? You certainly do not want to buy more trailer than you have vehicle to tow it with. Go watch the Long Long trailer with Lucy and Desi for a good education on that. Also consider where and what type of camping you are going to do with it? Put it on a seasonal site or tow to full service camp grounds or maybe remote camping in the National Forests. All of these things will play a part on the best type of RV for you. Also sleeping arrangements are important. Just don't get sucked into the first RV you see and like the looks of. BTW 25K for a two year old trailer seems kind of high to me.