I’m also not an experienced OBS user, but managed to connect OBS to Zoom through NDI Tools for Mac.
Within Zoom i use NDI as the camera provider. NDI in turn connects to OBS to be provided with the camera feed.
I’m happily using this setup for almost 4 months now on an almost daily base.
Try a Google search with the following keywords “obs ndi tools mac” and you’ll be provided with the needed information.