The answers to these questions are somewhat subject to opinion, so the best anyone can do is offer you opinions based on experience.
1 I put my kingsnake in wintersleep but im a bit worried about his weight because i didnt really got to feed him a lot before putting him into it. Now can i just weight him once a week while i refresh his water at the same time? Or is this a bad thing to do during the wintersleep? i just want to be sure he is okay.
I see no reason to weigh your snake every week. As long as he was of a normal weight and not anorexic or severely underweight when you put him in brumation, there should be no problems. His metabolic rate will decrease to the point that he is using very little of his body reserves while in brumation, assuming that the temperatures are low enough (65 degrees F. or so). You are better off not to disturb the snake any more than is absolutely necessary during the brumation period. Make sure that clean, fresh water is available at all times.
2 will 6-7 weeks be enough?
I would consider 2 months a minimum brumation period for breeding purposes, not including the 2 weeks to decrease the temps and the week or so to bring him out of brumation.
3 The pet store told me humidity isnt important with kingsnakes but keep the tank dry... now im reading other things on the forum and getting a bit confused, please an answer on humidity for cal king.
You have to match humidity with the particular species. In other words, try to simulate the conditions that species would encounter in the wild. Cal Kings come from a rather dry situation in much of their range, so I would say that a lower humidity would be required and the snake probably would not do well in a high humidity environment. That's not to say you need to set up a desrt type environment for him, just don't make any special efforts to raise humidity unless you see that the humidity in the cage is too low. California Kingsnakes are pretty adaptable critters. I would think that 40% to 70% would be OK. One of the dangers of having humidity too low for snakes that are not adapted to desert environments is problems with shedding due to dehydration. Dehydration can also bring about a plethora of other serious health problems.
