Okay. How do I feed my new bread yeast starter?

I'm down to a few packets of yeast and trapped in quarantine.

Last night I got a jar, filled it with a packet of yeast, a pinch of sugar, and a cup of warm water. It fizzled a bit. Ten minutes later, I added a cup of flour.

Then, I left it next to the heater so it could stay warm and cozy.

Today, it's got a layer of bubbles on top, so I'm hoping that's a good sign.


But what do I do next?

I know there is some week long process of either ignoring it or feeding it, or something.

What and when do I feed it for the next week while it's starting to form?

Do I need to remove some of it first before adding more food for it, or is that for once it's an established starter?

The internet is giving some rather random and contradictory advice.