Rommel,
One thing you'll need to note is that most extension tubes will cost you 2 f-stops and will require you to manually focus your lens.
Extension tubes are non-glass elements that you can add between your camera body and lens, effectively making your focal length longer. By doing that you allow your lens to focus at a much shorter distance than it normally would. All of the macro photographers that I know swear by them.
One other note, you'll want to make sure you have a tripod too. When you're shooting macro you don't want any camera shake.
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