When you get to FIS your points are set back to 999 so you are starting all over again. The lower your points are the better your race start positions will be. So you're going to be starting near the back in your first few races.
Moving from childrens category to FIS is like going from Primary school to Secondary. The regulations change so it's a big leap both technically and financially.
If you want to check the FIS points or biographies for any racer in the world click on the link:https://www.fis-ski.com/DB/general/biographies.html