glad to hear that
for shadows, tick the "Ground Shadows" box under the Environment tab. but it has ticked already. just tweak the shadow quality.
the key to add the reflections and get the nice reflections is the environment that you choose. you can use the environments included in program, or you can use the HDRi environments from another source on internet. just google them. then, tweak the environment (brightness, contrast, size, height) and gamma until you satisfied with the result. before render i usually use 32 samples and 4x Anti Aliasing.
about the flying car. right-click the model, choose "move model". rotate and push the car to the ground. it should be help you to solve the uncentered pivot point.
Thank you very much Henky! I finally get this
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