I love the art of macro so I bought myself a while back....

Nikon d3200 with 18-55 lens.
nikon 55-200 vr
raynox dcr 250
tamron 70-300 lens with macro function
extender tubes
macro ring flash
and a few other bits.

I don't have the money to buy a specialised macro lens, so I thought the above stuff would maybe help a little.

I just can't get a decent picture no matter how hard I try.
I believe the 70-300 needs to be further away from the subject to get the focus, but the rest I thought you needed to be close and personal?

I can get decent flower shots and other bits, but I wanted closer shots of bugs and water droplets etc
I have a tripod and remote shutter cable but just can get decent focus.
is there a guide to taking these bloody shots?
if not what's the best way?