Your best bet is to get a true DSLR camera; even a start up camera (Nikon D3100) is fine and if you don't want to mess with settings, just keep it on AUTO. We use Nikon's in our house, my wife is a photographer, but some people prefer Canon. That's all preferential.
When you take your photos, make sure that your settings are being shot in RAW/NEF format rather than jpg. RAW will take up much more space on your memory card, but it's capturing every bit of the photo/color, etc. rather than compressing it into a jpg. file. You import RAW files into an editing program and that will allow you to do much more as far as color enhancement, exposure, etc. You basically have a blank slate to work with rather than an already compressed file that gives you limited range when editing.
A good and inexpensive editing program is Lightroom 4. This will give you a HUGE range as far as editing controls go, without breaking the bank on something as expensive as Photoshop. The "editing" programs that you get on your computer are so limited, you are not going to get what you're looking for when editing through them.
Hope that helps some.
