Design

Hi, you can make your career in this field by pursuing B.Des in Transportation Design. Transportation Designers are commercial and industrial designers who are specialized, and who create designs for vehicles and transportation related products. You can further pursue your PG in the same field.
IIT Guwahati, DYPC, UPES Dehradun, MIT School of Design are some of the reputed institutions offering this course at UG & PG level. You can check website of these institutes for further details.

if you want to do business or your own work then Bachelors degree is not important you can learn courses online its easy but if you want to do job you must have a degree

Hey, web Designing is totally a digitalized course and there are ample opportunities as the digitization era has already begun so it would be at the boosting level so if you want know more about Masters in web designing then you can have survey of places in Ahemdabad as it is one of the leading cities of India in providing training in this course.

Hey, as you have interest in fashion designing then you can do as it only requires graduation from any field and it requires innovation and creativity and if you want to know more about fashion designing then you can make survey of Ahemdabad institutions as it is one of the leading cities of India providing this course.

Hey, as you are interested in web designing it is one of the emerging industry in recent times and it is going to grow in higher pace in coming years as the digitalization era has began so there are ample opportunities are awaiting so by this growing industry you also have great placements in web designing and if you want to know more about web designing then you can make survey of places in Ahemdabad as it is one of the leading cities of India providing this course.

Fine arts and interior designing both are very different fields. You will have to see which field interests you more and then decide.
Refer to the link below to get a better understanding:
http://www.webdesignerdepot.com/2009/09/the-difference-between-art-and-design/

Opt for one year diploma in interior designing from YMCA.

If you have got the admission in NIFT then don't just miss out the opportunity. Go ahead and pursue the course. Excel in your field and be the best designer amongst all as that is something that will take you to the great heights.
What matters in the end is your skills and not your institute.