little Guidence need to install custom rom on android phone

I am going to Flash the Rom of Q Mobile Noir i6. All is ready but I am facing the issue of


error device not found



adb reboot recovery

command. Google Usb drivers installed already. Since I am not able to Enable USB Debugging because Mobile phone stucks on Qmoilbe Startup logo. Also the trick of Volume +_ and Power Button Recovery is useless for me.
My concerns are.
Is there any way I use to detect my device(Since device not proceeding further from Qmoilbe Startup logo.)?
Any legitimate process that I use to enable Phone debugging via PC.?
Any help will be appreciated.
Thanks in advance.