Design

There are fashion designing institutes that provide certificate courses. Also, some fashion designers and textile artists hold workshops where you can learn things, but it is difficult to get admission in a degree course.

If you are interested in the same course then this is the best course for you. A course without any interest will not lead you anywhere so, stay in the same field and work hard. Don't worry about the job, if you are good at your skills you will definitely get a good job.

Thye best colleges for Masters in interior design is NID and NIFT.

The fee structure for both the courses differs from institute to institute. Refer to the links below :
Fashion Designing: https://goo.gl/5PaGPY
Interior Designing : https://goo.gl/AxNHco

Both interior designing and hotel management are very different from each other. For interior designing, you need to have good drawing skills and for hotel management, you should have an interest in cooking or baking.
Think of what is more exciting for you and then select the course.

You may pursue the one-degree course and one diploma course at the same time.

The career in fashion design is a long term project in one's life and it is one of the best paying industries. Some of the jobs you could explore in fashion design field are as follows:
1) Fashion Designer
2) Fashion Illustrator
3) Fashion Stylist
If your strengths lie in illustration, you should pursue a career as a fashion illustrator.