shaan,
First narrow you scope, thinking of learning multiple modules is unrealistic, at an very initial stage. Pick one module and give it few years. As you are getting a chance to become an MM enduser, you should focus on MM.
Make a plan, set a time line for example in 2 to 3 years, of being an MM end user, you will understand the major MM processes of your company. You will know how to complete all steps in SAP MM. Get an understanding of the problems business faces from both a system and business process pov.
TW