The church I attend is going to purchase the Panasonic HC-V785K camcorder to record weekly sermons so that shut-ins can view the sermons that we are uploading to YouTube. Each sermon can last anywhere from 15 - 22 minutes in length so we want to purchase a memory card that will be adequate for your recording needs. Any help will be appreciated

Memory SD cards are inexpensive. I like the Samsung 128gb card good value @ $15
https://www.bhphotovideo.com/c/product/1658167-REG/samsung_mb_sc128k_am_evo_plus_128gb_sd.html/BI/2855/KBID/3801 (https://www.bhphotovideo.com/c/product/1658167-REG/samsung_mb_sc128k_am_evo_plus_128gb_sd.html/BI/2855/KBID/3801/BI/2855/KBID/3801/BI/2855/KBID/3801/BI/2855/KBID/3801/BI/2855/KBID/3801/BI/2855/KBID/3801/BI/2855/KBID/3801)

You might want to eventually stream directly to Youtube with hdmi to usb adapter.