maybe here? http://www.kibesuisse.ch/verband.html
It, too, is in German, and I guess that if you're looking to run your own business, you will have so many dealings with government departments, and all the people you will meet along the way when out caring for the children, and dealing with the premises, insurance agents, etc., that you'll need a fair command of German, or else to find someone to whom you can delegate the Gemarn parts.
And this government department of Zurich offers advice for parents needing child-care, and perhaps they would be able to point you in the direction of the body which regulates such services. https://www.stadt-zuerich.ch/ssd/en/...betreuung.html
Some years ago I heard that anyone wanting to start up a kindergarten or creche can borrow, from the municipal department concerned, a set of 2 or 3 fat lever-arch files, in which all the procedures are set out, all the forms, etc. so one can peruse it thoroughly in order to test the idea agains reality.
And here, https://www.stadt-zuerich.ch/sd/de/i...onsmodell.html
if you click on the first point below "Subventionen" you will be able to download the "Verordnung" (= rules that govern child-care facilities), sorry, once again in German.
I don't mean to put a damper on your idea, because certainly many parents struggle to find affordable child-care. And if you do it in English, you might find that some expats of the top income bracket may be happy to pay higher fees (I don't know, that's just a guess). So yes, I think there is a market. I just don't see that you're likely to be able to fulfil all the rules about number of toilets, hygiener regulations, liablity insurance, registrations, police clearances, etc. unless you have someone to help you who is competent in German.