As per my previous post, I just purchased a mini-PC which I intend to
turn into a router.  Is anyone aware of a guide for turning a Debian
PC into a _home_ router?  I'd like to be running probably DNSmasq,
using a blocklist, stuff like that.  I've found webpages that tell me
how to turn on network forwarding, or maybe configure DNSmasq, but not
the whole process.

Please don't suggest pfsense: I'm well aware of it, and it may well be
better.  But I'm very adept at managing Debian, and initially at least
I intend to try to set this up.  If it turns out to be direly
difficult, pfsense may happen later.