I don't think copper with purple is possible. Possibilities ; copper with red fins, copper based but more red on body and fins, black/dark copper, greenish copper, yellow/gold copper, pure/silver copper ....... all metallic based colors, often crossed to dragons.
IMO the copper gene (or whatever) is now fixed/stronger in the sense that when you cross copper to green/blue you would get coppers as well as - green/turquoise, green metallic (a shiny light green), blue and metallic blue. And if you cross them to red, you would still have solid coppers, coppers with red fins..... not sure about reds (I've never mixed copper to red).
IMO, since you're just beginning, get a pair with colors you like. Don't experiment or think about creating something new because you'll end up with more than you can handle.