For most of the photoshop stuff I do I use photoshop elements on my laptop, it's not the most powerful tool but its nice and simple. For a simple approach that doesnt cost you too much time I would;
Crop,
Auto fix (sometimes does more harm than good but can save you some time fiddling),
Adjust Lighting>midtone balance, upward slightly (gives more impact in the picture between light and dark, colours "pop" more too),
Adjust contrast and brightness (shouldn't need to do much here if you use a decent camera)
Auto sharpen (be careful as this can pixelate an image horribly)
if there is a prominent colour that looks dead change the colour balance slightly by upping the saturation of that colour,
if the white background isnt "clean" enough then you could use a smart select tool to seperate it from the main image and have a fiddle with it but this takes time and is probably not worth doing.
I am self tought though so could get corrected here