Go to https://www.koltorahonline.com (mods, please allow) and to start, search for “kinder”. It’ll generally cost you a buck per story download. This will only work if you understand some Yiddish already. And it helps if someone can translate for you when you feel lost. Don’t expect “pure” Yiddish, and take it all with a grain of salt.
As your knowledge increases, you can listen to more “advanced” stuff. Don’t forget to make use of rewind as needed.
Good luck and enjoy!