And if you do not have Internet/Wi-Fi in your church, don't miss this article on how to use a smartphone. it says, in part
If your church doesn't offer you a web connection, you can still use your cellphone's web connectivity to show content on a TV screen.
If your church does NOT have WIFI, but your phone has a strong signal to a nearby cell tower, you can connect to the internet with your phone! Just remember that connection/data rates will apply. Find a volunteer with "unlimited data" to bring their phone into your classroom if you don't have it.
The articles give easy-to-follow detailed instructions on how to show online content on your tv, including what connection cable to look for.
Also, if you only have a VHS player and are having trouble locating videos, you may be able to find a low-cost DVD player at Goodwill or someplace like that. Or someone in your church who is only watching streaming content these days may have a no-longer-used DVD player they are willing to donate.