Your best bet is to get something that's well started. Somewhere between the 100-200 grams that has already taken F/T. Brian of BHB Reptiles has some great snakes and you could ask him any kind of questions you want. He has the YouTube page SnakeBytesTV. But yeah hes a great guy and if you have any worries about buying I'd buy your first from him. He actually makes follow up calls to see how you and your new snake are doing.
http://www.bhbreptiles.com/