Hey Jyotsana Gupta,
Fees details:
Inner Line Permit(ILP)- INR20/- per day per person.
This permit is not required for residents of J&K and Children below 12 years of age.
Documents:
Valid ID proof.
You can apply this permit online through the official website of Leh Administration.
Either you can apply personally or through a Travel Agent.
Hope this answers your query.
Have a good day!