How does one can get into drone racing? Where should I start?
I might also recommend getting a tiny whoop instead, those are very small drones for inside the house, they are super fun and you can fly them whenever you want, vs having to make a trip to a suitable location.
That should get you started. Nowadays I much prefer acrobatic wings, though, I made a Flitetest Versa from Depron foam for like $30 and it's amazing fun.
https://m.banggood.com/RadioMaster-TX16S-Hall-Sensor-Gimbals...
very small drones for inside the house, they are super fun and you can fly them whenever you want
House yes, anywhere with a fire suppression system _NO_. The little glass bulbs used in most of them don't react well to having a drone bump into them. Buddy of mine had this happen where he worked not long ago, you really don't want to be that person...