| As said i would go for either a hatchie or a yearling. You will need to get use to handling snakes and if you get something too big it might put you off keeping them. Also there is a slight chance that you could ge your first bite from an adult and believe me thats a little off putting.
You should want to have snakes to enjoy them, not to have them just to breed them and be in the reptile game for the money.
Cameron | 
