In Flex (beta), you can start a project from a blank canvas or from one of the pre-loaded templates found in the Flex admin space.
Starting From a Blank Canvas
Click the +Create button from either the "Try Flex" banner or on the left side of the "Flex experiences" header section of the admin area
Name your new project in the "Name experience" input box of the "Create new experience" window
Click the Create button
Once created, the new project will be automatically added to the "Flex experiences" section of the Flex admin.
Starting From a Template
Navigate to the "Start from a template" section of the Flex admin
Hover over the desired template tile
Click the Use Template button on the desired template tile
Once selected, the template will be automatically opened in Flex in a new browser window. Additionally, a copy of the template will be added to the "Flex experiences" section of the Flex admin.