Dixie - a couple comments. I have been breeding Black Copper Marans for 6 years now. If you are just wanting a few of your own chickens, nothing wrong with breeding what you have, although you will get differing opinions on that.
If you wish to be able to sell hatching eggs, chicks, or juvenile/adult stock at some point, then you should probably spring for some better quality birds. Without seeing them, it's difficult to know, but when you say your male has lots of copper, it's a warning flag to me - his breast should be solid black. Again, this would be if you are wanting to sell at some point later. You will need to get a copy of the Standard of Perfection for the breed - and there are a few threads you should look into here:
Here is the "main" Marans thread, for discussion of all varieties:
https://www.backyardchickens.com/t/383387/marans-thread-breed-discussion-pictures-are-welcome
Here is the Black Copper thread:
https://www.backyardchickens.com/t/444381/black-copper-marans-discussion-thread
There is a ton to know about the breed, and they were only accepted into the SOP (Standard of Perfection) last year, so we have a long way to go. Many feel it's not prudent to breed inferior stock, since we are working to get them perfected. But I personally don't see a thing wrong with using what you have, so long as you're not going to be selling them as exhibition birds.
Feel free to PM me with any questions, and there are many others who are very familiar with the breed as well!