I'm just starting on this road myself, really. It requires answering certain questions specifically. One of the key things is to ask what level of reflectivity the object ought to have. Most things reflect to one degree or other. Obviously, starting with the reflection of light, but then moving on to reflection of details. The differences between various surfaces has not only to do with differences in colour and texture (differences generally covered with the figure/prop texture you're using if it's good quality) but with varying levels and kinds of reflectivity.

Sincethe specific things you mention (chrome, cars etc) are HIGHLY reflective surfaces, the first thing you should do is learn how to create reflection.

At the top of the main page of this (Poser) forum, there's a sticky with a bunch of links to tutorials and threads relating to the material room under various subjects/goals. I would begin there.

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Hardware: AMD Ryzen 9 3900X/MSI MAG570 Tomahawk X570/Zotac Geforce GTX 1650 Super 4GB/32GB OLOy RAM

Software: Windows 10 Professional/Poser Pro 11/Photoshop/Postworkshop 3