[rhood]

I’m new at sourdough and hav a few questions:
I’ve watched the vids on YouTube and TikTok but am still unclear on a few things.
My starter is developed and ready. Haven’t baked with it yet.
After a feed, it doubles and then deflates to where it was. Is that normal?
Can I use it to make dough anytime or must I wait until it is doubled?
If I’m not using it, should I put it in fridge right after a feed or wait awhile?
And looking for a recipe for a single batch in a loaf pan.
Thanks