The following are some links to high school para-church organizations. Many have labored successfully for decades in this context. Don’t feel like you have to start from scratch. You don’t. You can learn from them. In fact, we encourage you to not “re-invent the wheel.”
This isn’t a comprehensive list. Feel free to add others to this forum.
http://www.cruhighschool.com/resour…-training/ (There are a lot of free and available resources here. Enjoy.)
https://www.younglife.org/Pages/default.aspx