One thing I would like to draw your attention to, is that CA has specific requirements for who can be a director or a teacher at a large day care center (outside your home).
You say you have 0 background in EC. That means you can't be a director and you would need to hire someone qualified to be a director at your center. That means paying salary to that person before you get paid yourself
In home day care providers do not have this qualification requirements, but you can care for less kids. If you are on your year 1 it's 4 infants. You already have a daughter, which means you can take only 3 more. So unless you find 3 people who would pay you 50k annually, I say your estimates are unrealistic.

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