Let's take it point by point. Firstly, of course we must tell our students where we get this stuff from!! I hope that it is all right that I do it at the end of the year, because then I feel that they can appreciate what I am saying. I also tell them about my teachers that gave me tips on where to go to prepare.
Second, even if you are only giving over someone else's shiur -- I have no problem with that. As Rabbi Fohrman has said, no one expects the math teacher to be making things up herself. It is enough just giving it over in a way that imparts knowledge and skills to students. We are not paid to be cutting edge researchers but rather teachers. Finally, they won't read the article themselves! That is why they are teenagers and come to school.
I do believe that I am giving quality shiurim!! Bottom line- I try and use good stuff wherever I can get it from. Just credit it! I feel that Rabbi Menachem Leibtag is my rebbe in learning pshat, Dr. Bonchek is my rebbe in learning rashi. Nechama Leibowitz teaches you how to handle rishonim and compare them. Sharei Aharon brings the topic clarity. Nachshoni gives you source material. Dr. Sokolow just gives nice and easy lessons. I could go on and on.
It is my creativity, however, that puts it together the way that I do. The lessons that I bring out are based on who I am. I create my own worksheets. My own tests.
I have my own method of going through a sefer...
I could go on and on but I think that you get my point.
Danielle Bloom
Ateres Bais Yakov of Monsey