Where to get official information on Roman Catholic Doctrine doctrine?

I am a member of the Lutheran Church Missouri Synod in the USA. I belong to a group discussing various theological issues. I am interested in the differences between our doctrine and Roman Catholic doctrine. One of the problems we have run across in the past is understanding what is the official Roman Catholic position on various questions. Many times we will find people who claim to know Roman Catholic doctrine and then discover that their explanations misrepresent the official position of the Roman Catholic Church. This is not helpful. So, I am trying to discover where we can get correct and official answers to our questions. Is there a forum or other online resource that we can use? We are not looking for resources that simply point us to online versions of canon law, since becoming an expert in canon law by reading it would probably take years; and then we might not interpret it correctly. We are looking for resources that we can use to ask questions. We are not interested in quarreling or demeaning the Roman Catholic Church. We only wish to obtain authoritative answers to our questions.