Why not bell, or visit, your nearest flying club where you'll get all you need to know from the horse's mouth.
Cost wise... I don't know precisely but likely to be an arm and two legs in the UK. When my son tried it cost him around £6k, 10 years ago, and he never finished it due to problems with the flying club.
There's a goodly amount of studying of various subjects including meteorology, navigation, air law, etc.
Good luck...