Our church wipes all ministry teams in the spring and then we have a major sign-up season (aside from the main question, I would like to add that this is super not ideal for children's ministry, but we are trying to make it work and/or workshopping a better way to line up with what the rest of the church is doing while simultaneously avoiding what has become a constant stress headache known as "regular" spring...) We have a main training time once a year. Sign-ups are the second half of Feb. through the middle of March. I decided this year to leave the rest of March and all of April open for meeting with new volunteers before multiple May trainings. We will split up by team so we can be more focused with what each team needs trained on. Other than that, it's been on the fly training and 1-1 meetings. I would like to implement regular videos or audio (podcast/seminar style) to send out so my team can feel better equipped. Each week's curriculum does include a one-page training on both large group training and small group training (it's the same for a month before it changes to a new topic/focus). However, I'm not sure how much they help or are used. Sorry for the long response, but I hope this helps (or maybe at least brings about some suggestions on what we can do differently haha)