Are you considering learning any Bible languages? It may prove to be helpful for you to consider some tips on starting the process offered by Koine Greek scholar Kirk Jongkind. His insights will help you in several ways, ranging from motivation and attitude, to understanding how grammatical “rules” influence the majority of situations but that there are always exceptions.
Learning Greek is much more a way to sit closely at the feet of the true Teacher, than that it is a tool to become a better preacher.
Dirk Jongkind