I have been told by a friend that a new Muslim boy convert cannot marry a Muslim girl. He can only marry with a new Muslim girl. Kindly guide me in this regard.
There is no such command in Islam. Islam allows marriage with a believer regardless of the duration of his or her faith. We need not listen to those who forward claims without asking for sound religious proofs. I would suggest you ask those who forwarded this claim for arguments. I hope you will find none.