Eurorack: you're about to spend a ton of money on a style of synthesis you can't really learn much about without spending a ton of money acquiring. There's enough " chicken-and-egg" to make a large brunch crowd full.
You will make mistakes. You will spend hundreds of dollars on gear you find of little use to you later on as you define your needs. You will then find that there is a use for that gear you wanted to cast off because now you have a better understanding of Eurorack.
Rinse... repeat.
It's an expensive journey that never ends. :)