You are not alone, I too started out the same way, then picked a breed that was being raised by a friend of mine and fell in love with them! If you go to American Breed livestock Conservancy, they have lots of good information on managing a breeding flock and how to evaluate your flock, and they used the Buckeye as an example. Then go thru your flock and do the best you can to cull out was doesn't fit the bill. Then you will have a place to start, to decide if you need to bring something in if you need to. Also, the American Poultry Association has a book call the Standards of Perfection. A book of all the recognized breeds in America, it's a bit spendy, maybe you can find a used copy, even an older one, but it outlines the qualities and defects of the breeds, with this you can also compare your flock and cull if necessary. I don't know where you live, but maybe you can even find a mentor. This is what I was told, and I have done. I don't know if I picked the right birds or not, I did the best I could, and I will just have to continue to hatch and cull till I have what I think fits the description. One way to know of course is to take your birds to a poultry show, I was told you don't know what you have till it's out there being looked at. That's what I will do to.
So this is what I have learned thus far, from one "newbie" to another! Good luck!