Having read through the comments on this, I have to add, there is no standard of what insulin dosage you should take.
Everyone's body reacts differently to the dosage you take, not only that but everyone's body still produces different levels of insulin naturally.
My work colleague and myself are both on the same insulin, however we both take different dosages.
I would suggest start at around your average, so if you are having toast and eat toast in a morning, say you normally do 10 units. Do 10 units and check sugars in morning. You may then alter this level as you see fit.
Hope this helps