Full-timing in a TT.....where should I start looking?

I suggest you attend a RV show near you so you can narrow down your choices.
Figure out what specific things you want like maybe a walk around bed, large shower, storage, etc. Then make your choice.
I would also NOT buy a brand new RV for my first. Very few people keep their first rig very long. After they use it a while they find they want something else that will suit their needs better.