You don’t create a church culture. You have to let it happen by consistent behavior among church members. If you encourage people to get together and hang out, and people do it, it will be built into your church culture. If you make an intentional effort to reach out and love on them, it eventually becomes a culture.
It’s action, not church policy or rule. You can’t install a new church culture. You have to cultivate by actions, and it takes time.