Philately: The Art of Stamp Collection

I have been collecting stamps for about thirty years and I could not find a handbook, which can help me to understand how I must collect and what I must collect and how it should be presented in an exhibition etc. Since I have been involving myself with the department of posts in conducting workshops for the school children I thought it is of paramount importance to have a handbook on philately, which could help everyone who collects, may get some preliminary idea of stamp collecting. If no...