Dear Bhakta Nikolai:
Hare Krsna! Jaya Srila Prabhupada.
You wrote a very nice article. Do not worry, you have the proper attitude and will succeed. Just follow Prabhupada’s instructions in his books and Krishna will make the proper arrangements.
You wrote “But when I ask question of my devotee friends they say we cannot understand guru but we must be humble follower. They say the authorities know what is right and what is wrong and our duty is to listen to our authorities.”
You are correct in rejecting this advice. The guru must follow the sastric injunctions, just as Srila Prabhupada did.
Perhaps we cannot fully understand the guru, but it is easy to make sure that he is following the 4 regulations, chanting 16 rounds and teaching only what is in sastra. If he is not, then he is not bona fide.
Many devotees of ISKCON followed the advice of just listening to the authorities and are very, very sorry that they did. Do not be misled.
I wish you and your family all success in your devotional service.
All glories to the assembled devotees!