Since you already have a sound system, you have the biggest expense out of the way. I suggest using the laptop with Karafun, buying a mixer w/effects and a 5 mic wireless system to complete your needs. A set up would look something like this.

https://www.amazon.com/Mackie-PROFX4V2-4-Channel-Compact-Effects/dp/B00VUU702A/ref=sr_1_2?keywords=mackie+ProFX4+mixer&qid=1579817801&sr=8-2

https://www.amazon.com/Shure-BLX24-Handheld-Wireless-Microphone/dp/B00BRQ5AK6/ref=sr_1_17?crid=7B82CC8OI0DJ&keywords=wireless+microphone+system&qid=1579818175&sprefix=wireless+microphone+system%2Caps%2C618&sr=8-17

https://imgur.com/a/FAoQAd7