You see the ISS due to sunlight reflecting off its solar panels.
Doubt you would have seen it during daylight.
If you go to
http://www.heavens-above.com
and choose somwhere near you or use your latitude and longitude you will get times when you can see it from your location. Always give it a few minutes either side of the stated time. What you will see will look like a fast moving star. Remember, negative numbers are bright eg. -1.5 is brighter than -0.5
To check for planes use FlightRadar24 - either their app or website.