Hi JAY77355 and Welcome Aboard!
I love this hobby, it's given me many many years of enjoyment from my youth until now. You definitely are into Lionel 3-rail 0-gauge with that ZW transformer. What you can run is almost anything designed for 0-gauge. Some locomotives and rolling stock require wider radius curves that the standard Lionel curve track. (031) But What kind of track do you run on for starters? 0-gauge (taller) or 027 gauge (shorter)