How To Flash Custom Recovery for Androidone

So, I was attempting to root my phone(CanvasA1- 4GB) today running stock android marshmallow(6.0.1) :D, I successfully unlocked the boot loader in fastboot using adb, after which I flashed TWRP recovery, Which was successful but then, When I rebooted into recovery, I saw my old stock google's recovery running :(, I tried 2-3 more times flashing the recovery in fastboot but the probem was still the same :crying:. Then I came to know that we have to flash a special type of boot img of some 17.5mb approx, When I attempted to flash this "boot" image, I received an error saying file size too large, Hence I couldn't flash it, I am still running the stock recovery, With my bootloader unlocked, I need to root my phone, Please help someone, Thanks in advance .:)

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