Holiday care

Hi all, I work during term time at a private school, I have my level 3 and I am in the process of doing my forest school leader training. Our school nursery was open all year round but is changing to their term time which is leaving a few parents stuck for childcare. school have said we can have a private arrangement with the parents to care for their children when school is closed. How do I go about becoming a childminder during the holidays?
Grateful for any advice :)