Um, more with breeding experience should really respond, but I don't think the length of the snake matters, but they need to have reached sexual maturity. Do you have the male or the female? The Ball Python Manual says males should weigh at least about 650 grams, usually at 16-18 months of age. Females should exceed 1,000 grams, usually around 27-31 months of age.

Also, if you have a normal ball python and you mate it with an albino, you will not get any albino babies. You will get het albinos.

I suggest you really read up on breeding if that's what you want to do, it's pretty complicated.