I agree, it would be best if you could smoke with an experienced smoker first.

But you aren't inhaling anyting if you aren't blowing smoke out. You would certainly see it.

My suggestion would be to smoke out of a pipe first, I'm sure your dad would have some lying around. Suck the smoke into your mouth, than open your mouth a little and inhale as much air as you can as quickly as you can. You will likely cough up a lung, but it should get a lot easier after a few hits.

Does your dad know your are pinching his stash? Why can't you ask him to teach you? To young to ask?