Formation of us subsidiary

My resident Indian client, with his partners in the US has formed a company in US. Now to start business in India itself, he wants to float a company here in India. My questions: 1. Which kind of company he should form in India? A subsidiary or WOS? 2. He is a director in foreign company. Could he be the Indian representative or again a director in Indian company? 3. What would be the additional requirements for forming such kind of Indian company? 4. There are many more questions but i think it should go in a conversation form so will ask on getting the reply for above questions. Kindly, give ur humble opinion at the earliest. Thank you