Transmission shifts into gear, but the car does not Move?

I was driving down the road, I saw smoke, pulled over and turned car off. Turned back on, the car went into gear but wouldn't move. I got out and looked and all transmission fluid was on the ground. My car wasn't overheating when it was smoking, and it hadn't been slipping either. Had a jumpy feeling when turning on I believe. Also, there is a fluid leak for sure on the passenger side somewhere in the engine it's all wet.