A torque converter, flex plate question, and install question..
First ya gotta bolt the flexplate to the engine. install the torque converter onto the trans by turning clockwise, it should seat one time, then turn the torque converter counter clockwise, it should seat a 2nd time. then install trans onto engine, get the torque converter to flex plate bolts one at a time from underneath, rotating the engine for each bolt.
walmart fluid, or any kind is just fine. atf-4 youll be just fine. if ya wanna feel warm n fuzzy, ya can use chrysler/mopr atf available at the dealership.