Several resources are available to help in presenting lessons/messages and in recording them.
For the following, you will need a setup at the church where there is already a computer or a place to plug in your device (know what you have — VGA? HDMI? etc. Apple devices can work with Apple TV’s on same WiFi network, or with an HDMI adapter for a direct cable; many Android devices have MICRO HDMI ports that use a microHDMI to standard HDMI cable).
Slideshark iOS (free, use with Powerpoint slideshows you have made; works great with Apple TV)
Voice Recorders (There are many options you can find, but most cost a few bucks to have unlimited recording time; I really like RecForge on Android; I’ve also used an MP3 voice recorder from Sony, with a lapel mic attached)