1- If you have import our dummy content and you want to set any template as a homepage then just visit this page.
https://codex.wordpress.org/Creating_a_Static_Front_Page
2- If you have not import our dummy content then you need to do following step.
1- Go to WordPress Dashboard --> All Pages --> Create New Page.
2- Select Template from template dropdown "Like HomePage V1 or V3 etc"
3- Publish Page.
Then Visit this link and see how you can set that page as your homepage.