MBA/PGDM

There are many good B-Schools offering MBA. IIMs are the best to pursue MBA. Check this link for some other B-Schools-
https://www.shiksha.com/mba/ranking/top-executive-mba-colleges-india/18-2-0-0-0

You can pursue PGDM in marketing, operations or information system management. You can also pursue MBA in entrepreneurship also.
Brock University offers this course. Before you start your search, please decide whether you wish to pursue an MBA or a PG Diploma.

Yes, you can get direct admission in Sikkim Manipal University through management quota to pursue MBA in pharmacy.

FMCG companies such as Unilever, Dubar, Protector & Gamble, Colgate, Coca, Pepsi, ITC etc. are excellent companies for internship for a MBA marketing graduate.

Yes MBA will give you a good basic knowledge of business scenarios and business terms. It will be like theory and then practical. If you directly go in business then you will get more learning through practical scenarios.

Economics is an excellent field if you are interested in economics and want to make career as an economist. However, MA in economics is a niche degree with comparatively lesser scope in comparison to PGDM or MBA.

Financial modelling, equity research, credit analysis are some topics you can search for. For financial engineering is also one of the emerging branch you can look for.

It is not mandatory but a necessity to have managerial experience to get admission in top B-Schools in USA. Candidates with 3 to 4 years relevant management experience have better chances in getting admission to MBA and also better chances for placement.

Full-time MBA from a prestigious B-School has better potential in term of opportunities and career growth in comparison to E-MBA.