A one-pager theme that have what you need to get started. This theme fits for smaller sites that don´t have a lot of content.
Kirby CMS is a file-based CMS (no database), that’s easy to setup and are easy to use.
No matter what theme you purchase, you´ll need a Kirby license - from $19.
And if you don't want to handcraft one—or want a clean theme to start out to make it easier to tweak it to your style without coding everything—then getkirby-themes.com is what you need.