It's always best to start at the beginning.
4 seconds sound clip from the The Wizard of Oz (1939) movie soundboard.
You can hear this line at 00:32:00 in the Blu-ray version of the movie.
Quote context
[...]
- He lives in the Emerald City, and that's a long journey from here.
- Did you bring your broomstick with you?
- No, I'm afraid I didn't. Well, then, you'll have to walk.
- The Munchkins will see you safely to the border of Munchkinland.
- But how do I start for Emerald City?
- It's always best to start at the beginning.
- And all you do is follow the Yellow Brick Road.
- Just follow the Yellow Brick Road.
- My! People come and go so quickly here!
[...]