I've had the most success breeding North American colubrid snakes -- bullsnakes, garter snakes, and corn snakes.

IMO, all three species need a day/night temperature cycle.

Corn snakes can get by with a photoperiod that roughly mimics day length, which varies from short in the winter to long in the summer. IMO, a 2+ month brumation period at around 55 degrees Fahrenheit helps.

Bullsnakes need a 2+ month winter brumation at less than 55 degrees Fahrenheit.

I bred plains garter snakes according to a plan developed for red sided garter snakes. They did not need a light cycle, but they did need a 3 month brumation period at less than 45 degrees Fahrenheit. And garters are likely to die if fed thiaminase-containing fish for long periods.

Corn snakes are probably the easiest to breed. So many people breed corns that the babies may be hard to sell.

The entire Pituophis genus should be breedable using the same formula as bullsnakes. I'd call them a little harder than corn snakes because of larger size and brumation temperature.

The garters are third hardest mostly because of diet and brumation temperature.

Most of the Pantherophis genus should be breedable using a combination of the corn snake photoperiod and the bullsnake brumation time/temperature.

Plenty of people breed kingsnakes and milk snakes. I haven't tried because those species are snake eaters. However, if I did try, I'd try first with the same conditions as I'd use for the Pantherophis genus.

Good luck.