If you only want a small flock, stick with your legbar for now, you’ll get some lovely barred birds, they will be golden cuckoos, blue cuckoos or similar a to legbars in colour. Get a feel for how breeding them works, understand your marans Chooks and see which colours you become fond of. If you get a Marans rooster, I suggest you pick your favourite variety and focus on that rather than breeding lots of colours as mixing them can ruin the perfect examples of each one. Someone will have to correct this, but I think you shouldn’t breed wheatens with birchen/coppers as they become quite messy. I don’t see why you couldn’t breed coppers and Golden cuckoos, just know that some roosters won’t be fully cuckoo.