If you are not using demo import then you will have to manually setup the front page. To do that create a page from your dashboard by clicking Pages-> Add New
On the right sidebar you under Page Attributes section on the ‘Template’ dropdown click on Home Page.
You can leave the page empty after that and click on publish. After that goto Appearance -> Customize -> Homepage Settings. There on ‘Your homepage displays‘ Click on ‘A static page’ and set the page you created as front page. You can also create a blank page and set that to blog page.
You can then goto Appearance -> Customize -> Homepage Customize and setup the contents. Make sure you enable the sections from ‘Enable/Disable Sections’ before you set the contents.