Bachelors

MBA will be better for you if you want to go for management area but ultimately your passion and motivation matters a lot.

Yes, go for it. If you are graduate, you are eligible indeed.

Yes, you can pursue MBA after the completion of your Bachelors.

Hi,
The eligibility criteria for Narsee Monjee College of Commerce and Economics for Bachelor of Management Studies:
A candidate for being eligible for admission to the BMS degree course shall have cleared HSC Examination of the Maharashtra State Board of Higher Secondary Education or its equivalent examination or Diploma course in any Engineering Branches with two years or three years after SSC conducted by the Board of Technical Examination or its equivalent examination by securing minimum 45% in one attempt.

Hello,
It is about 16,000$ to 17,000$. You can apply for scholarships as you get good marks in GRE and TOFEL.

Graduate Diploma has less value than degree. Bachelor's degree is better to go, if you have plan for further studies.