It sounds like you're using the lancing device. You may need to change the setting so it pokes a bit deeper. I personally hated the lancing device. I would free hand - I felt like it gave me better control and there wasn't the "click" that made Gabby jump. OTOH, other people really like the device.
Also, don't get frustrated! It takes a while for the capillary bed in your cat's ear to more fully develop. In the beginning, it's harder to get a cat's ear to bleed. You may want to use a wider gauge lancet -- something like a 26 - 28 gauge. You can also try poking twice in the same spot (or nearby) which may get you more blood.
That's a large starting dose of insulin. We typically start cats at a much smaller dose. This is a
link to the Prozinc forum. There are sticky notes at the top of the board that will provide you with a great deal of information about Prozinc, dosing, etc.
What are you feeding your kitty? Many of the prescription diabetic foods, especially the dry foods, are high in carbohydrates. A diabetic needs to be on a low carb dies (i.e., less than 10% carb and most people here feed their cats in the neighborhood of 5%). If you're feeding a higher carb food, I would not change that until you are able to home test. A switch to low carb food can drop blood glucose numbers and you need to be able to know your cat's BG level for safety reasons.