Pi-hole is super easy. Literally just install it, and set your dhcp on your router to push out that IP as your dns server. Configure pi-hole to use an upstream dns server.

https://pi-hole.net/

There’s a bunch of launchers out there. I did mine a while back and used Wolf launcher, but later found out it was a “hacked” version of some other paid launcher. I used launcher manager to “enable” it on boot. Right out of the box, it has all apps and no ads. I suspect any launcher you go with will be similar.