I was just wondering when my 1 month old fry would get their colours? Also i would like to ask anyone who has sold guppys how much they normally sell for?

What variety of guppy do you have? If they are common wild guppys they won't get you very much, I bought young wild guppys at the LFS @ 6 for $0.50 to cycle a tank a few years ago. You will probably get more for one of the developed strains but I wouldn't plan on getting rich off of them, lol.
I can't help you with when they color up, my young guppys didn't last that long, once the tank was cycled I put 2 Angel fish in the tank and the guppys became snacks :pft: I thought they were big and fast enough to keep out of the Angels way but I was wrong.
Oh well, lessons learned.