As you have done MBA in marketing I will suggest you to go for SAP SD or CRM.
SAP Sales and Distribution help you to manage system configuration, master data, order and cash process transactions. Whereas SAP Customer Relationship Management is known as integrated customer relationship management module by SAP that helps any organization to achieve their business goals and allows them to perform all Customer Relationship tasks efficiently.
I see that you have experience in the administration field, could you please explain in detailed about your job responsibilities so that I can guide you about the right module which will suit your experience.
If you have any questions feel free to reply to this thread.
SAP FICO ECC & S4 Hana Certified Consultant
As per my administration job responsibilities my role as a Operation manager. I was responsible for Company vehicles maintenance and acquired on rental basis.
Acquired New offices in different cities.
Keep Vehicles Fueling record
Arranged Hotel and Air tickets
Make PR in Oracle
Handling Petty cash