Welcome to the family Michel 
There is a lot to unpack in this introduction and I like it. I feel like you will get on extremely well here.
We enjoy hearing about peoples experiences as much as we like seeing their animals.
We have a whole thread dedicated to encouraging children to get involved … Junior herpers are the future, let’s see those kids with reptiles … if it wasn’t for a certain someone on here, one of my daughter’s would never have touched a snake at all, let alone cuddle up with boa constrictors like she does now.
As much as you probably wish to find out the sex, I really recommend not attempting to sex it yourself.
At that age you will not only find it difficult because of the snakes size, you may also cause injury because of lack of experience. (If you have a local reptile store they will more than likely be happy to show you what you are doing and how to go about it.)
Some of the breeders in Holland are doing crazy work. You have access to some beautiful animals.
As @hinglesherps has said, a picture of your set up will make any problem solving 100x easier. You will find some great tips in the link @wreckroomsnakes posted aswel, I recommend bookmarking that thread for the future.
Here is another thread that will help you out aswel… Switching snakes from live .
Again, welcome to the forum