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
It is so important to know your insulins (onset, peak and duration of each). I found using a 5x7 index card and making a chart of all the insulins really helped, especially for clinical. Definitely recommend laminating if you take it into your clinicals! Best of luck.