Try and read all (typically two or three per class day) but if pressed for time, aim to read at least one, starting with the first on the list and write a well-condensed and composed (no rambling or waffling, please) journal either combining all/any of the readings or doing an in-depth analysis of one text of your choice.
Supplementary readings are for your own reference, also potential material for your further research, and so there is no need to write about any of them for your journal unless you happen to find anything particularly interesting.
Teaching Writing at John Jay College 