Doing an MBA through correspondence these days is not an issue at all! Umpteen number of institutions have opened up but that does not serve the purpose. Try doing a regular MBA as you learn the intricacies of management better by experience than through bookish knowledge. You can take up Operations & logistics management which basically deals with planning, purchasing, sourcing, movement and control of logistics and inventory etc. As you are a Commerce graduate, you could also think of Finance/Retail/Marketing fields.

All the best!
Counselor