Yes - I always do post work. Almost all images have an exposure adjustment layer to get the brightness/darkness balanced. I usually add a color balance adjustment layer as well to play with warming or cooling the image off more. Then lots of these have a Color Lookup adjustment layer (LUT) applied. The more you do it the more you know when you have to get it done in 3d and when you can do it in post.
I save out everything as PSD 16bit from Cinema and sometimes I run the Camera Raw Filter, but I like to keep adjustment layers so I can keep tweaking with ease. Color grading can really push your images, so getting that into your workflow is important. I also have Magic Bullet Looks and use that sometimes. I find it's Chromatic Aberration to be superior to Photoshop.
For lighting I suggest studying cinematography of film. I'm trained as a stage and opera designer and I'm married to a lighting designer, so lighting is a big part of my life all around. Take a look at Matthew Scotts' website - under lighting he shows commercial shots and setups and then diagrams the lighting - really great way to see it in action: http://mattscottvisuals.com/lighting
And - as always - just make as many images as you can and put them out there in the world.