My tuffy is about 12 years old. Newly diagnosed with diabetes. Today was the first day for insulin, I am doing everything myself sns it is a bit overwhelming. Today seems to be going okay, but I have a few concerns that I'm afraid I will only be able to figure out with time. One; how do I know when to not give him insulin? Two; how often should I feed him now? I am obviously new to all of this, and any help I can get will be greatly appreciated!