I joined a Kosher sourdough Facebook group several years ago in hopes to finally make sourdough. I just haven’t had the energy or time to put into baking sourdough. But it seems like everyone I know has jumped on in and started making their own sourdough.

Getting Started with Sourdough & Starter Recipes

The advice I think I have heard most is to start it Motzi Shabbat or Sunday, so you don’t have feeding issues with Shabbat. 

Sourdough Recipes

Sourdough Challah