I'm not sure about the Oculus store, but on steam some good VR games are Pavlov, Boneworks and Half-Life: Alyx. I also tend to just look on the newly released games to see what interests me.
For motion sickeness, when I first used it I never had any problems with the movement, but I did stop using it for a while and when I came back I felt as if I couldn't play as long as before. It depends on person to person, but the more you play it to less sick you will become.