I think it is needed that new players are able to learn the basic mechanics of the game without being able to be killed or stolen from while doing so. You shouldn´t have to cope with someone killing you over and over while figuring out how to split stacks, how to use the different machines or any other basic functions.
For this I would suggest an extended tutorial that allows you learn about all these mechanics.
It should also include lessons on these topics:
1. full loot (getting all your shit stolen, teaching never to take more than you are willing to loose)
- bonus: you can get it back, creating a nice revenge story.
2. priest camping (teaching that you can avoid it)
3. blue blocking (if that is still a thing with the new flagging)
4. thievery
5. death, death, death
I have tested Haven in MO1 and sadly I think it falls short in teaching new players properly. It creates the illusion of safety within a very limited space without teaching you how to survive. It is basically a rather limited PvE server. Obviously there are still exploits that allow griefing, but the fact that those players have to manually be teleported from the island shows how flawed the concept is.
I predict that Haven will lead to a lot of disappointment when someone quits playing there and learns that the real game is vastly different.
EDIT: You should also keep refund policies in mind. Letting someone play PvE for 10 hours and then throwing them into open PvP with thievery etc. will lead to player wanting a refund.
A properly designed tutorial would be able to teach a new player everything they need to know and just as before you can give them a bit of starting money and equipment. AFTER it has taught them that they will die and loose it at some point.
I´m not gonna go into the whole issue with creating a safe region where you can generate resources since I made a thread on that already.
tldr:
Make a proper tutorial that teaches the real game rather than a shitty PvE server that only creates a false impression of MO2.
Give new players something to fall back on, both in terms of knowledge and material.