So, the bad news here is that although you've put the close-focusing distance of these lenses in the description, neither of them are real macro lenses. If you zoom either one all the way out, it will give a magnification of about one-third. A "real" macro lens will bring this to 1:1 -- the image projected on the sensor is the same size as the real object. For the super-impressive insect and flower close-ups you see, you'll want to do something better.
One approach is buying a dedicatd macro lens -- not a converter, but a lens which has 1:1 macro in the specifications. (Almost certainly a prime lens.) See How do I choose a macro lens for a Canon APS-C camera? for more.
You can also get great results using extension tubes or reversal rings -- we have a few great questions on that, too: