Female age/weight, Male weight/female Ratio? Estimating Profit of Pairings?

[iCandiBallPythons]

Ok, I apologize in advance, I'm sure this has been covered somewhere at sometime.

Firstly, I have 3 females currently all of which were born this last june-july 2012. I've seen some folks say that 18months is an ok time to begin breeding them. However the breeding season generally starts in november. Would my girls have any possiblity of being ready by the 2013 season? I know there is alot of variables in the growth of the snake.

Secondly, any of you guys have rough estimates on how much weight should be on a male to safely breed 4 females? 3 days in, 4-5 days out would be my method. I know that some folks breed their males very young but I doubt that such young males could safely take on 5-8 females from the reading I've done.

Thirdly, Do any of you guys have any methods of calculating projected profits from your pairings? I know my way around the WOB genetic calculator and the binomial equation but I'm a little confused as to how you might estimate projected prices of offspring in a consistent way.

Thanks,

-Chris

Just an FYI they will breed year around there is no set time frame