I've been tying my own for 40ish years now. I started out by taking some feathers from one of my mom's prize feather pillows, "borrowing" some of her thread, whittling a clothes pin into a tying vice and some old bait hooks I found snagged at a local stream. Things have changed a LOT since then, but that same fascination and satisfaction with creating something to catch fish with, is still there...
Most fly fishers I know started out by buying their first few flies, then getting frustrated with how fast their precious investments get lost in trees and snags and broken off on fish. A cheap starter fly tying kit comes next. After that, it just seems to develop a mind of its own and it grows and grows...
Best of luck to you...
Rick