Diploma

Hello,
The fee structure of the course depends upon the subject and college in which you are getting admission. So, without choosing college it would be difficult to say. But, as per my view if you are seeking a good college then the fees would be in range of 25-35k.
Follow the link for some colleges providing distance Diploma:
https://engineering.shiksha.com/distance-diploma-in-maharashtra-categorypage-2-57-1-0-0-1-114-2-0-none-1-0

Yes, you can pursue both these courses simultaneously.

You can pursue PG Diploma in sports psychology through distance in Mumbai University.

You should opt for Diploma or degree course in mass communication.

You should pursue some course in designing. You can opt for AUTOCAD. It will be helpful for you. Try to gain as much practical knowledge as you can.

You should opt for AICTE approved 3-year Diploma or degree course.