When you want to get bigger arms, it should be important to only get the information from the reliable sources. Getting information from those who are unprofessional may only lead you into a wrong path.
Hence, for you to be assured of the information, you need to seek someone who has already proven himself as the “expert” in bodybuilding. If possible, check the background of the person. It would be better if the person has his degree related to body building, say for instance, sports science. A sports scientist has knowledge on the human kinetics. He has studied the field for years so he can surely know what he says.
You can also check the best and most trusted body building books written by very good authors at the nearest bookstore. Surely, they have something to say and contribute to make your dream a success. That is why many have already succeeded because of them.