We’re firm believers in the classical education theory; I can recommend Douglas Wilson’s book based on Sayers’ essay, Rediscovering the Lost Tools of Learning, though at the time he was more skeptical of homeschooling than he is now.
Sayers is absolutely my favorite modern fiction writer – excellent characterizations and dialog, and her plots hold water well. She was Oxford educated in the classical liberal fashion and knew how to use it. I re-read The Nine Tailors at least once a year, and Murder Must Advertise is a gem. Hers are the standard for all other mysteries here.
The BBC did several outstanding productions of Sayers’ stories in the 1970s, with Ian Carmichael as Lord Peter. That series only covered the stories which didn’t include Harriet Vane; a second series about a decade later filmed the remaining novels, but I haven’t seen them yet.
If you like Sayers you might also enjoy Josephine Tey, who was also the daughter of an Anglican village clergyman. Tey is darker than Sayers (her protagonist always seems to be recuperating from an injury or a breakdown or something) but her style is similar.