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This page provides an easy-to-read high level overview information on the Ordination Procedure in the Theravada Tradition.
For details regarding the ordination, including eligibility etc., please see the Theravada Vinaya section on Ordination, translated by Ven. Thanissaro.
Please contact the Maha Bodhi Society for more information on how to become ordained in the Theravada tradition in India. They have many branches in India - please see the diagram below.
You can also try the All India Bhikkhu Sangha.
There are also many Tibetan Buddhist monasteries in India, like Namdroling Monastery in Mysuru etc.
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You must search for an enlightened person and take initiation from him. Then you follow and execute your guru's instructions for advancement in spiritual life. That's what monks do.
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It is generally believed by the Vinaya monks that ordaining in India is not good. I think it is because the Vast Majority of Indian Monasteries doesn't follow Vinaya or of invented traditions that follow a different Dhamma.
In Buddhism, Re-inventing any new ideas (as truths) either by ordaining as a solitary Hermit or ordaining in an Invented Tradition considered faulty, since the Omniscient One has already revealed the Truths. There is nothing to be revealed by others. The Disciples are only needed to follow the guidance that the Buddha has laid down.
Anyway, you can find some advice on Where to Ordain in following links, if you are looking for other options in other countries.