Sir i have the xadow gsm+ble module but i dont want to use the xadow audio but my own audio input and output devices …Please tell me how to do it?? Step-By-Step tutorial is appreciated as i am a complete newbie to this xadow modules or even this electronics world ???

If you are completely newbie, then no one can provide a step-by-step tutorial.
It’s just way too much. Hacking rephone HW is not your level. If you can’t solder a small amplifier to the 2 output channel on the breakout board, don’t start with an advanced device like this.