John, if you and the target are potentially moving then this becomes very challenging. Start simply, stand still!
On a Fuji I would set AutoISO to 6400, min shutter speed 1/200th, this is usually fast enough for street work if I stand still and the target might be moving, I can always up the min shutter speed to 1/500
On the Canon G7x you have an Auto ISO mode but you cannot specify a min shutter speed, but you can specify Slow/Standard/Fast, it looks like Standard is 1/160 before ISO adjustment and Fast is 1/1250 before ISO adjustment. So neither is ideal for street but if you and your target might be moving then I would set it to Fast, better to have something grainy and sharp to start with than blurred. As you experiment you might be able to lower to Standard.
Then I would set the camera to aperture priority of say F4 which will give you a reasonable depth of field.
Set the lens to focal length that you are comfortable with, initially with street this might be quite long, but as you get more confident it will decrease. Levae it at this focal length, don't cahnge, get used to working at a single focal length, it will simplify your thinking process with regard to street.
Now you can either work in AF or Manual Focus, I would recommend to get sharper shots to Manual Focus, preset the camera to work in a particular focus zone, now either you move or wait for your chosen target to get in the right position in the field of view. If the G7x AF is very snappy you can stay in AF. If you want to be discrete then disable all sounds emitted from the camera eg focus lock, etc.
Hope that helps