What type of camera do you have, Zouave? Because even if your camera isn't very good, it's still very possible to take nice pictures.
A few suggestions for your pictures:
Make sure there's lots of light. Preferably natural sunlight, if possible.
Turn off the flash, and make sure you hold the camera very steady. You can also make a makeshift stand out of books or Lego, and that can help a lot.
A good clean background is a good idea. If you can't use a big piece of paper or cardboard, trying using a sheet.
Make sure the macro feature on your camera is turned on. This should have a little flower picture as the icon...
Hopefully that can help you somehow. :-)