Hi, welcome to the forum.

1) Pacmans and pyxies are from different genuses. Pacmans are Ceratophrys and Pyxies are Pixiesomething. Ornates are pacmans but they are genetically different from the species you will probably be aquiring which is Ceratophrys Cranwelli. They are similar but Ornates get slightly bigger in my experience (like 0.75 inches or so) and are brighter colored, as they keep their color into and through adulthood.

2) Humidity range should be between 60 and 80ish%, but they are pretty tolerant of humidity ranges as long as it stays moist in their habitat. I've kept Cranwellis from anywhere between 70-85 without any negative consequences.

3) Yes

4) Tupperware container, coconut fiber

Hope this helps