Ans: As you are 50 years age and has vast experience in this field.
You can look for a job in the relevant field through job portals.

Ans: In whatever is your area of interest, talk to as many experts and consumers you can.. evaluate if your idea is solving a real problem that your potential consumers face. Fine tune your business idea. Then again talk to people if they are willing to pay you money to sort out the problem.. and how much. Concurrently, talk to experts on the cost of solving the problem/ offering the solution. Wherever you think the cost of solution is lesser than what people are willing to pay, is a good idea to work on prima facie. Then create a detailed feasibility report. Take help of some expert at this stage. Understand the investments and evaluate how you will need to fund the business initially. See if you can get some grants / seed funding. Typically seed funding is through friends and family . There are also a few govt schemes for entrepreneurs- see if you can get some grant/ financial assistance under these schemes. Put some of your own money and start implementing your idea in the mean while. Don’t be over optimistic in your planning. Work for the best but be prepared for the worst.

Ans: Dear Mr Dinesh,
It looks like you have been through a lot after getting into business on your own. Your children too are at a critical stage in life which requires funds for higher education in the next few years. The first question to ask yourself is - what is the priority in your life? Is it financial stability for the family esp for the kids? Or is it the pursuit of your business? The second question is - what is the current status of your household finances? Is there enough savings to manage the household, upcoming education expenses, other expenses (travel, medical etc)?
If you are shaky, it may be time for you to consider taking an assignment which offers you a fixed remuneration and also flexibility to work on your idea. You say you were in the field of IT security. Can you consider an assignment which might take 2-3 days per week managing and overseeing the IT security for a company which cannot afford a full-time professional?
You may also want to consider getting incubated in a good healthcare incubator in your city and also apply for a start-up funding grant from the government of India and/or local state government programmes.