you can use localbitcoins (https://localbitcoins.com/) or paxful (https://paxful.com/) at india to buy ethereum easily. you can also get a lot of payment method there also. hope it will help you

you can also make a post or move this post at india section. here is the direct link of India https://bitcointalk.org/index.php?board=89.0 (Bitcoin Forum > Local > India)