Perhaps the best advice I can give is.....slow down. No reason to hurry this process. Buying anything the magnitude of a camper is a large purchase and you are starting out smart by gathering information.
I echo the others who suggested a pop-up, which your Toyota could easily pull. I started with a very basic pop-up which taught me a lot about camping and what we (as a family) really wanted in our next camper. And there are some pop-ups which have really desirable features such as toilet/shower, furnace, A/C, and the like.
Are the teenagers buying in to this idea? I have a teenager myself and she seems to view the whole camping thing with your typical disdain, even though we now own a TT with many more luxuries than the pop-up had.
Also, starting out fresh with something such as trailer camping can result in information overload (easy to do with this forum). Choosing a pop-up or hybrid might make more sense than buying more camper than you can afford and more camper than your vehicle can pull.
Welcome to the forum!