Welcome to BYC. I don't think there are any simple steps to breeding different colors. For instance breeding a white to a black will not produce gray. You have to know what colors went into the background of your breeding birds that produced the colors you have now. Without knowing what is dominant and what is recessive, you are just shuffling cards in the dark. Maybe you could post on the game bird threads and follow information from someone who has already made some of the crosses you are interested in.