I have heard some males going at 1.5yrs old, but i've never personally seen it. Usually males and females are ripe and ready to breed at 2.5 to 3 yrs.
You can breed them year round, kinda like balls. The photoperiods play a major role in breeding, although some use temp drops.
I usually pair one on one, males in with females and vice versa. If ones isnt breeding, i'll take a female that is receptive and put her in the cage and mist them down. She will usually get her scent all over the non breeding female and will breed.
The most females I have bred a male to is 3. Although you may be able to do more, the male usually has his hands (penes) full (empty) with that many.
Check out bloodpythons.com if you are seriously wanting to get into bloods/short tails.
later
Jordan