You still have to create your villagers and start producing resources to built your population, army and siege weapons and also progress through the ages while your opponents do the same. Only that they start from scratch.
Don’t be over-optimistic by your advantage of having a walled village from the start. It takes a little load off you but make sure you get your resources and progress in time.
Download Scenario File
(Unzip the the archive and copy the *.ao2scenario file to you custom scenario folder)