Hi billfern,
I have a RPi4 but I read you can use a Pi 3 without a problem to run Home Assistant.
I installed HassIO on a SD card using this method :
(it’s recommended to use a SSD instead of a SD card though)
Then I plugged my Wyze bridge to a USB port of my Pi and followed this tutorial :
It’s pretty straightforward, just requires to install HACS first (which is also explained in the video above and is very useful not only for the Wyze integration)
All this requires some time but is not complicated. And is really worth it 
Hope this helps.