Which part? If you’re wanting to use cloudflare pages, it’s relatively straightforward. You can follow this and get up & running pretty quickly: https://www.hongkiat.com/blog/host-static-website-cloudflare-pages/

If you’re asking about the tarpits, there’s two ways (generally) to accomplish that. Even if you don’t use cloudflare pages to host your site directly (if you use nginx on your server, for example), you can still enable AI tarpits for your entire domain, so long as you use cloudflare for your DNS provider. If you use pages, the setup is mostly the same: https://blog.cloudflare.com/ai-labyrinth/#how-to-use-ai-labyrinth-to-stop-ai-crawlers

If you want to do it all locally, you could instead setup iocaine or nepenthes which are both self hosted and can integrate with various webserver software. Obviously, cloudflare’s tarpits are stupid simple to setup compared to these, but these give you greater control of exactly how you’re poisoning the well and trapping crawlers.