Just PO or IV too?
If PO I recommend you divide into categories like biguanide, sulonylureas, etc. Then list the ones in each category and the MAJOR side effect, how soon they work, and what is main contraindication (for instance, Metformin cannot be given for 48 hours after a contrast dye was given the patient).
If IV you need to know which are rapid (end with "log"), which are short, intermediate and long-acting. Then you need to know the onset, peak and action periods. There are grids and tables on the internet for all this if you look. Try diabetes.org