I'm a mod from r/RSA and our motto is to encourage a healthy discussion even if you don't agree with it. this allows you to see the opposite sides perspective and ultimately results in revelations to work forward. Also remember that too many rules nomatter how good the intentions are, could cause the opposite effect. a good example of this is infact what happened to r/southafrica.
overmoderation causes not only unnecessary work for mods but also creates frustration within the community. sometimes what you as a admin want goes against what the community wants and vice versa. so with this in mind really think deeply and broadly about rules that you would want to have. basic good rules are, no hate speach, no racism, no doxxing.
also things to keep in mind, is that the world of the anonymous internet there will be bad faith actor's and they come in all forms to infiltrate your community. sometimes there goal is to soak emails so that they can sell them to advertisers, sometimes it's spamming ads for their crypto get rich quick investments. ect ect