And if you do not have internet/wifi in your church, don't miss this article on how to use a smart phone. it says, in part
But 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.