I have recently purchased a Canon 50D that came with a Lens "kit". Those lenses being the 18-55 & 55-250 IS type.

Now having blown apart all the goodwill of my partner, I find myself wanting to try a little macro photography. Having no goodwill floating about to try my chance at buying a macro lens at the moment, I am hoping someone can point me in the right direction for getting either extension tubes, or a close-up lens.

Now the tricky bit is knowing what I should be looking for that will fit my camera, or the lens, if anything can indeed do that? I have read many web sites and still seem totally confused on this point.

Any guidance would be greatly appreciated.