Acting

Refer the link:
https://www.shiksha.com/college/ice-balaji-telefilms-institute-of-creative-excellence-andheri-east-mumbai-41500

You haven't mentioned any institutions. But generally, it is better to finish the class 12th before going for such programs.

Since you are from a business background, it would be difficult for you. But it's all about your influence and money. When applying for the visa you have show them proof that you are qualified to take the course. Getting an offer letter from the University is not a big task. But getting your visa accepted will be. You can apply for the Masters programme if you have significant experience in theatre field. Otherwise don't take the risk of losing money through visa rejection.

As you have completed your class 12th, you can apply for this course.

No, you have to complete class 12th.

Yes, you can, provided you qualify all eligibility criteria for Nepal citizen.

You could apply at the time of B.Com itself, because B.Com and LLB together helps to you know save the time and years.

You may pursue modelling course from the following institutes:
1. Center for Research in Art of Film and Television (CRAFT)
2. R. K. FILMS & MEDIA ACADEMY
3. Northeast Institute of Fashion Technology.

Anupam Kher's Acting School the basic criteria is that you must have completed your 12th. Further, you can fill in the admission form and get into it. The link for admission forms are mentioned below:
http://www.actorprepares.net/admission/forms-schedule/.

Go to this link:
https://www.shiksha.com/college/ice-balaji-telefilms-institute-of-creative-excellence-andheri-east-mumbai-41500