Insulin isn't really going to help with strength gains. It will help to volumize the muscle and retain more glycogen, which can lean to increased muscle size. So indirectly, it will help, because bigger muscle is usually stronger muscle.
If you use insulin correctly, you won't "feel" anything after you take it. You will experince better pumps, but it will have no effect on hunger.
2iu will be a good place to start and get the feel for the nutritional plan you're going to use. It could be enough to go hypo if your carbs were low enough, but on most diets, it will easily be covered. I would suggest taking it preworkout after a meal containing carbs that will support your insulin needs. Then sip on an intra workout carb shake containing carbs and EAA. After training, continue to feed the insulin using solid food.