This is an easy-to-follow tutorial to help you create screencasts. Be sure to choose "teacher" when signing up as Loom will upgrade you to their Pro version for free.
This is a Google doc that lists mentor texts that are available in the Haude library for all subject areas - English Language Arts, Math, Social Skills, Social Studies, and Science.
This website has resources such as author interviews, websites, and book trailers. It has recently become a subscription site, but there is a 2 week free trial option.