Tom, Welcome aboard.
We started in a tent too. Then moved to a small trailer, then a bigger trailer, then a bigger trailer, then a motor home, then a Bigger motor home. You get the idea.
While renting is a good idea, to start, it's not the same as owning. Even our smallest RVs had their own set of linens, utensils and clothing. When we'd get back from a trip the perishable foods would be carried in with the dirty laundry. The cleaned laundry immediately went back into the RV. We could decide to go on a whim, everything but the perishable food was already packed.
Trailers were a bit more work to set up than the motor homes, but either is simpler and easier than the tent site, in my experience. For the many years we used a tent it was like building and tearing down a house every time we went out. From home we had to load everything, at the site we unloaded and had to not only put up the tent, but 'build' a kitchen, if rain was a possibility, build a shelter over the table and cooking area. Once the weekend was over, tear everything down, pack it back up (never seemed to fit as well going home, hmmm??), unpack when we got home and had to put everything away. I've always found RV travel much more relaxing, in a much wider range of weather conditions.
As it's your first, buying an older used rig to start out isn't a bad idea either. If you decide 'this is the life for me', and want to upgrade, (or decide it's not for you, and want out) you'll get most of your investment back.
Good luck in the hunt. We'll all be interested in keeping up with your search. Remember, even those of us that have been RVing for 30 years or more started right where you are now.
Jay & Peggy Monroe with Dolly
Can't take it with you - don't plan on leaving any behind
2016 Newmar London Aire 4553, Spartan chassis
Wrangler Unlimited toad