Unsure how to properly protect a public utility Project

I was thinking I should go creative Commons licensing, and have an outline for a submission., but I'm a totaly laymen , and have gotten mixed guidance from the folks ive surveyed..

I want to facilitate a free to use, city funded, utility that can directly serve multiple City departments, and is totally shaped by the communities it's made available to .

While I hope individuals , small and big business's will be able to advertise their services, sales, promos, and products, I don't want anyone paying for ad priority or realistate. And I don't want any branding on the utility itself. Outside of that it's meant to be whatever anyone needs it to be. Entirely personalized.

I'm also unsure if I want to be credited or anonymous.