MICAEL WIDELL, DPREVIEW:
There are several good lens options out there for macro photography. You could use extension tubes combined with a normal lens, which gives you some magnification; or, even better, you could reverse a normal lens which, when combined with extension tubes, gives even more magnification.
The most convenient and flexible option though, especially for a beginner within macro photography, is to get a dedicated macro lens.
Read more, and watch the instructional video, from here.