I haven't done much propagating lately. But, I used to do quite a bit, and I simply used heat mats and grow lights, a pretty standard, basic setup. Make sure you use a good seed starting mix. Don't use too much mix, so use small containers such as seed starting trays. Don't water them too much, but don't let them get too dry. Heat mats and grow lights should provide you with more than sufficient heat to ward off cool temperatures, which shouldn't really be a problem when propagating seeds inside during a zone 10a winter (it was a little more of a problem for me, since I actually have a winter where I live).