If you take a look at the RAF website https://www.raf.mod.uk there is a lot of information about the various roles available. You will see they are recruiting heavily and the skillset is varied depending on the entry level.
As a starting point, head to your local RAF base and they will be able to guide you through the process.
I have checked the royal air force website, and it looks like all you need to join ls proof that you have graduated Secondary School.
Hope that this information helps you BJ