LW have stated that they are going to be giving us some free content in the near future. If you watch
my videos on import and
export you might get a sneak peak at one of those called the 'Isle of Kandril'. It's a PF realm but will give you a good look at how LW are using the tool.
Until then you won't find any 5e exports as they have been disabled for now. Someone out there might be able to share another game system.
You could also create a new realm and add in the tutorial content. It gives you a brief insight into how things can be done.