the changing pad part was just a vinyl covered foam piece.
This is what I had with my first baby. With my second I had the curved/concave kind. I preferred the flat kind. I don't think you really need padded bumpers for the sides but you do need some kind of railing or something. Also, most changing tables have a belt to strap the baby on. I never used it unless I needed to walk away for a moment but even then, I usually just took the baby with me. Good luck in your TTC journey!