Diploma

The fees for different colleges are as follows:
1. Institute of Distance Education, University of Madras- Rs 2,430
2. Netaji Subhas Open University (WBNSOU)- Rs 9,300
3. Indian School of Technology and Management, Mumbai- 14,900.

Yes, you can definitely apply for diploma in acting and modeling after 12th in respective college.
All the best.

Mentioned below is the criteria for taking admission in the respective college-
Candidates must have passed PUC or 10+2 examination in any stream or equivalent from Academic/ Vocational / Open schooling stream of any recognized colleges or Universities.
OR
Must have passed 10th standard plus two-year ITI, ITC, NSQF level 4 in any branch.
OR
Must have passed 3 years Diploma in Engineering/ Technology/ Management/ Commerce/ Arts/ Nursing.
OR
Should have passed any other qualification considered equivalent to 10 +2 by Govt. of India.

Yes, HSC is compulsory. It is an important gateway to cross for applying various other courses as you wish!

Since you have 1 year of work ex, you should consider going for a full time MBA/PGDM. It will give you a good boost to your career. You can check the top HR colleges here - https://www.shiksha.com/mba/articles/amp/top-10-mba-hr-colleges-in-india-blogId-6938.

The Advanced Diploma course in commercial photography is a full-time 12 month course, with a total fee of INR 1,77,922.

No. You need to have post-graduation for pursuing Ph.D. in any field. Diploma makes you eligible only for Graduation. So, go for similar thing.
All the best. Please like and follow.

Avinash, IT sector is in boom right now. Either, go for graduation in it. Or if you are looking for job, keep searching for vacancies for government. Jobs on various platform like newspaper and job websites. You can easily get a private job if you search for it. All the best. Please like and follow.

Yes, you can do B.Ed.