This has been asked before, @Mark-and-Kym0, but it is nearly impossible to find because searching for "new" brings up everything but this. So I will try to remember what I read, in case it helps. The NEW flag is not something you can trigger. It shows up like magic. That's what I think I remember. But what I do know for sure is that reviewing and editing your listing is a very good thing. It not only keeps your listing looking active to whatever in the programming decides in what order listings are shown, but it keeps you on top of what your listing looks like and says. So keep that up, even after you've had a hundred guests.
I hope NEW magically appears for you, but for now you could put "NEW!" in your summary and description if you like. As you said, it will explain the lack of hosting reviews. All the best! Love your "cheers" profile pic, by the way.
