There is no "official" printed documentation for program MARK - the canonical documentation is (in effect) the MARK helpfile.

  However, MARK is a large, complex program, and in general it is not an application that can be learned by simply browsing the helpfile. The recommended starting point for learning to use MARK is to consult the 1,200+ page (and ever-growing) online book "Program MARK: A Gentle Introduction...", co-edited by Evan Cooch & Gary White is the primary starting point. Reading this book (or, at minimum, the 'core chapters' 1 to 11)) is strongly recommended as your first step in learning to use MARK. This book is 'deep dive' into both the theory & mechanics of using MARK. If you want to become well-versed and proficient -- both in using MARK, and the models & theory for analysis of data from marked individuals -- this is absolutely where to start,

MARK forum

In addition, there is also a moderated online forum devoted to issues concerning using MARK, and related software. This is your primary source for 'support' when using MARK.