I am in no way an expert on Kiruv, but I find your premise very puzzling. You state “I know that when talking to someone who is not frum one is not supposed to let them know if the do the same things if those “things” are not within Torah boundaries.” Why on earth not? Did you hear this from someone with experience in Kiruv? Unless you are dealing with a young child who may be confused by “mixed messages”, I would think that one of the greatest Kiruv techniques is to share your own struggles. You can teach by your example that we are all trying to grow and improve and get closer to the ideal at all times. For example, if you learn Hilchos Tznius, I don’t see what is wrong in saying “This is what Hashem wants, and honestly it is something I am working hard at but struggling with. I know it is the right thing to do, and I hope that soon I will be living up to what I know I need to do.” This can apply to anything you are doing “wrong”.
The only point I feel is different is your last one, where you say you have some questions about believing in G-d. Being that this is not simply a matter of having trouble acting appropriately, but rather the key underlying premise of everything, I would strongly encourage you to do whatever you need to the find the answers to your questions — not simply because you don’t want to be “hypocritical” when doing kiruv, but for your own self!! There are many books and resources out there, and I don’t know specifically what your questions are, but R’ Waldman’s book “Beyond a Reasonable Doubt”, and R’ Kellerman’s “Permission to Believe” and “Permission to Receive” are great places to start for general questions with regard to belief in Hashem and the Torah. I think you should probably try to address your questions before continuing with your kiruv work.
Good Luck!