Macro is not easy! That's the first thing to know.
The Raynox is a supplementary close up lens, though a very strong one and very high quality as these things go - it's three glass elements (some are only one) but don't expect miracles. It just allows your normal lens to focus much closer.
How close you can go depends on the mother lens, and the focal length set. Have a play with it and you'll soon find out the range you've got. Main thing to note is you get a bit more working distance between the lens and the subject with longer focal length settings.
If you're unfamiliar with macro, prepare to be surprised at how little depth of field you'll get - like a few mms at best. You will never get everything in sharp focus, so pick your spot carefully, by moving your body back and forth, as mentioned above. The shallow DoF is because of the high magnification - it's the same with a Raynox or any other lens or attachment applied in this way.
Because of the shallow DoF you will usually need to use a high f/number to get as much of it as you can. You still won't get much! Raising the f/number also improves optical quality, particularly around the edges.
The high f/number, combined with the magnification which also increases the risk of camera shake (normal hand-holding rule doesn't apply in the usual way) means you also need high shutter speeds. And that's not easy except in very good light, plus you will usually be shading the subject with your own body/camera. IS doesn't work so well at very close range, but use it anyway. Bump up the ISO.
It all works against you, which is why flash is a popular solution, preferably ring-flash because you're usually so close there's no room for a normal gun. You just have to find the best workaround.
The higher the magnification, the harder everything gets. Macro is a whole new world in more ways than one. Told you it wasn't easy