If you are sincere, then find a qualified scholar at a reputable muslim institute and tell them clearly about your intention. So they can formulate subjects suitable for you. You can start off with learning some basic course. Try www.ebrahimcollege.org.uk or www.sunnipath.com However one can't become scholar so easily, it takes about 5+ intense years of full time education starting at early in the morning. in addition, the teacher does not necessarily give permission to a graduate to teach islam if they feel they have not understood the subtlties or wisdom of the teaching. Allahualam