Figured I'd make a thread about this, as a member here brought to my attention that there's not much information on it.
After the mantids have mated, keep the female well-fed. This will help her lay a bigger ootheca, and the bigger the ootheca, the more nymphs there will be. Don't over-feed her, just give her enough so that she's looking fat, but not like she will explode. It will take a couple weeks for a Tenodera to lay the ootheca, though other species can take up to a month. She will lay it right in the sunlight, or under the heat lamp if she is in an enclosure. Before laying the ootheca, she may become frantic, and be crawling around a lot. She is just looking for a good spot to lay the ootheca. Once laid it should take about 6 weeks to hatch. Treat the ootheca the same way you'd treat the mantid. Give it sunlight during the day, darkness during the night, and mist it once or more times a day.
After the mantids have mated, keep the female well-fed. This will help her lay a bigger ootheca, and the bigger the ootheca, the more nymphs there will be. Don't over-feed her, just give her enough so that she's looking fat, but not like she will explode. It will take a couple weeks for a Tenodera to lay the ootheca, though other species can take up to a month. She will lay it right in the sunlight, or under the heat lamp if she is in an enclosure. Before laying the ootheca, she may become frantic, and be crawling around a lot. She is just looking for a good spot to lay the ootheca. Once laid it should take about 6 weeks to hatch. Treat the ootheca the same way you'd treat the mantid. Give it sunlight during the day, darkness during the night, and mist it once or more times a day.