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Frances, great to see you getting into your new SC. Congratulations!
That first image is an Ungo Box TL-3000 car alarm. Search here and on Pelican for how to remove it. You'll end up with a pretty big pile of wires and sensors, plus a siren. You just need to be careful that you don't accidentally disable the car when cutting and removing wires.
Second image is the temperature sensor for the auto heat. Third image looks like the base for an old cellular phone antenna. You obviously don't need that anymore.
That car phone pic sure is nostalgic. Reminds me of a guy my brother knew, who had one of those antennas put on his car, even though he did not have a car phone, but just wanted everyone to think he did!