DD always wanted to sleep on her tummy too but I didnt let her until she could roll.
I just gave her lots of tummy time and still put her to sleep on her back.
It is up to you though, I have known friends that have slept bubs on tummy from the start. Whatever you feel better with, it will only be a little while before he is rolling though so if you can put up with it until then that is what I suggest.