Heya,
It really comes down to what magnification you need and from what distance you want to maintain it at.
I find most people who want to get into macro, don't actually need 1:1, because what they're shooting is too large to actually fit at 1:1.
I would suggest you start with a simple set of tubes. The fotodiox pro series tubes are $50 with electronic contacts and work fine. Great way to get into it. You can then use different lengths of tubes to get whatever magnification you want depending on the lens used. You could get the pricier Kenko ones, if you just want to spend more money for the same thing.
Light is more important than figuring out all this lens/tube business really. A big part of macro is having enough light. Rigging up lighting/flash/diffusers, etc, for close range work.
If you really get into macro, then get a macro lens. You can always use extension tubes with the lens later too for even higher levels of magnification. As well as TC's (teleconverters) to make for big magnification setups.
I started with extension tubes, went to a diopter (clip on lens), and then to macro lenses and TC's. I still use all of them though depending on my needs. These days I use a 180mm macro lens with a 2.0x TC, for a 360mm lens that can focus at 18" and maintain 2:1 magnification at that distance. But I bug hunt, so I need high magnification from far away.
You may find again that the size of the objects you want to shoot are actually too big for 1:1. So again, this is why this depends.
Very best,