To elaborate on what I said earlier, not every player browses the forums, so there are going to be those people have have no idea what the server is about, and some people won't even know what DayZ is. People are going to join and think it's a free-for-all with zombies walking around. It just doesn't seem very fun if people are just going to be killing players on site.
We'll have admins over watching, there will definitely be help commands as well if people really need them. Along with that its not very complicated, you won't really need a full in depth tutorial.
As for people not understanding features, it won't be a problem. When you are bleeding, cold, or if anything otherwise it will give them a warning message and what to do.
For example if you're bleeding, the warning will look like "You're bleeding! Use a bandage!"