How old is he, and does he have any other musical experience? (I shouldn't really be sexist and ASSUME he is a boy - Sorry!)
Basic musical experience on keyboard, recorder, or some other instrument is useful BEFORE starting drums, but obviously the perceived 'glamour' of a drum kit can be a big lure for a young person!
I took up drums aged twenty, but already played a bit of trumpet, also piano 'by ear'. Pop and rock are the things that get seen on TV, but a GOOD drummer can play ANY kind of music. I had professional lessons for about four years. I never became as good as I had hoped, but for around forty years I played in pubs, clubs, dances, old-time music hall, folk, C&W, a bit of Classical, pantomimes and musical theatre (South Pacific, Guys and Dolls, Oliver, Annie etc) and several years with a barn dance band.
See what music lessons are available via your school, LEA, or county, but also learn another instrument as well if possible. On the Internet there are various 'virtual' drum and percussion sites, some are free; but of course the 'real thing' is much better! Keyboards from £100 upwards should have percussion from the keys, and can be 'programmed' via the keyboard, MIDI or computer to play drum sequences.
It's unlikely you live in this area, but this is an excellent county site I found recently:
musicservice.durhamlea.org.uk/percussion/
If you search down this you should get to samples of the Percussion section:
eyesometric.wordpress.com/category/young-musician/
And if you want to know what drums is REALLY about try this: