I'm making local website to deal with murder,How would I conceal my ID?

Put simply, I'm making a website to empower my local community to share information about murders in our neighborhood. However, because of the real and sensitive information that will be shared, how would I conceal my identity so that if you're a criminal (gang member, murderer) you could never find out who I am, or the members of the community. How would I conceal any identifiers (my credit card info I use to purchase the domain, my ip etc). I'm not worried about a low level finding me, but if you were a well connected criminal who could hire a private investigator, I want to make sure I can't be found. I will become a clear target. The website will make a lot of very dangerous people angry. Thanks in advance. - Benni Frank.

Is this even possible?