Hello everyone,
I am a software engineer. I am just starting a company with 40 people.
I am recruiting people as trainees without paying salary for the first month.

The second month onwards,their salary is Rs.6,500.

After 5 months,their salary will be Rs.10,000+.

Can I give them training without paying salary? Is there any law that forbids that?
Should I pay P.F for them? Is it mandatory?

Once I start paying E.S.I,Can I stop paying ESI after their salary goes beyond 10k since its not compulsary?

If someone can advice me on this,I would be grateful.
Thanks,