As far as guides: If you have an old Dell lying around you could install EmbassyOS on it to run a Bitcoin/Lightning node pretty easily: https://docs.start9.com/latest/diy/diy-x86#flash-and-install-embassyos
Another easy option would be to install Ubuntu or Debian on that Dell and then install Umbrel by running the command on their website in the “install on anything that runs Linux” section: https://umbrel.com/#start