I want to find someone's flower shop business license. Where can I do this?

Absolutely. They will have to bring it to a specialist.

Yes, but there are restrictions in some states/counties. For instance if you live within a certain distance from a school or bar or church it may disqualify your residence. Call...

You have to. And your license (once received) has to be in view inside the business address.

Yes.

If you sell them on places like Etsy, you won't need one. If you want to sell them on the street, check your city's vending rules.

Speak to your local city hall about acquiring a business license with limited liability (so that parents can't sue you for your own personal assets). After all, private schools ARE...