Questons about Oil and Tranny Fluid

Just bought a 92 4 cylinder automatic...NO OWNER's MANUAL

How can I tell what tranny is in the car?

What kind of AFT should I used when I change it>>> MERCON V???

Can I change the fluid in the torque converter (drain plug??)

What weight oil in should go into the motor...5 w 30???

Thanks in advance

Dave