Your layout is empty!
Go to Joomla Administrator > System > Site Template Styles.
Click on Sparky Framework - Default and open Layout tab.
There, click + ADD ROW button to add some rows and then drag'n'drop elements into the rows.
We prepared online documentation that will guide you through the development of your website with Sparky. Everything is covered, from the installation of Sparky to the export of your finished website.
Thank you for developing with Sparky!