I choose two free online photo applications to help me Picmonkey and Fotofuze
When taking photos of the items, I use a white background, take a few and decide which ones to use.
I alter them in Picmonkey . It is quick and easy, just a couple of steps
First (unless you have got the camera angle perfect) straighten your picture by clicking on rotate and moving the circle on the bar until you are happy. I also crop (if necessary) at this stage.
Next I adjust the exposure by clicking Auto adjust. I then play about a bit moving the Brightness and Highlights bars slightly until I get the look I want
I do the above steps on all my photos. The main one I then go on to edit in Fotofuze. I use the magic highlighter and the smallest circle and start to highlight around the edge of the object, once you start to do this it will automatically fill in the item for you. Click finish when this has been done and download the completed photo to your pc.
These are the photos of the stages (sorry but I forgot to keep a copy before I straighten it - but you get the idea)
I hope this is helpful to you, it also happens to be my first tutorial (-:
Enjoy and have fun playing with your photos.