Two females or a male and a female will do better together than two males, IMHO. Feed separately to minimize the chance of cannabalism, of course. And some corn snakes do much better alone than paired up. That's what they call individual differences.
IMHO, minimum for one corn is a cage with a floor area equal to that of a cage half as long and a quarter as wide as the snake is long. For each additional snake, minimum is minimum floor area for the largest snake plus 25%. Bigger that that is better, of course.
IMHO, a corn that is tame and well adjusted to captivity can be handled up to two hours a day every day. Skip handling the day after feeding, and possibly two or three days after a heavy meal.
I can't say about weight, but an adequately nourished corn should double its hatching length in the first year and triple its hatching length by the end of the second year. Power feeding can grow them faster than this. Hatching length is in the 10-13 inches range.
Various peoples' experience and preferences can differ. But, IMHO, the Loves' The Corn Snake Manual is the single best source of info about corns that I know of. If another source has a major disagreement with Bill and Kathy, ask about it on one of the corn snake forums.
Good luck.