We do not provide these types of policies with CBOX because the types of sites using CBOX can vary, but it’s a good question to ask.
If you need more sites for reference, check out the following to perhaps use as a basis for your own: https://digital.com/privacy-policy-generators/
Those sites should also have templates for Terms of Service as well.
With regards to Guidelines for Participation, Mozilla has a pretty decent one that is licensed under the Creative Commons Sharealike license: https://www.mozilla.org/en-US/about/governance/policies/participation/. Some other ones can be found here: https://www.webpurify.com/blog/community-guidelines-best-practices-examples/. As long as you cite their license and license your policy with a compatible license type, you can adapt it to work for your site.
Hope that helps!