Hi there! I started a batch of sourdough starter on 01.24.23 with today being day 4. I don't think mine is doubling at all, but I'm not for certain. I am using the King Arthur method/recipe listed on this website and weigh everything out by grams. I have a questions:

How bubbly should it be?
How much discard should I have?
Should it fill more of a container than my starter? If so, what is the best way to tell that discard is ready to use?
What is the best way to tell when your starter is ready to use?

I am feeding my starter every 12 hours and keeping it loosely covered inside our microwave.
I am not feeding my discard, but am storing it in the fridge.

Any suggestions would be greatly appreciated as I am brand new to this and afraid of messing it up.

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