To freeze a clip, position the CTI at the frame you want to freeze and export a still image (File>Export>Frame). Then right click on the still in the Project window and choose Insert. This will insert a 5 second freeze at the CTI. Adjust as needed.
To play 2 clips side by side, put one on V1 and the other on V2. Select onee clip and click on the word Motion in the Effects Controls palette and resize and reposition the clip in the Program window. Repeat for the other clip.