This link help me a lot
http://www.kenrockwell.com/tech/macro.htm
u may need
tripod
remote controller
Grey card
view box
try to shoot under the same light, i have my camera set up with the gray card and always take pics under same intensity and spectrum.
Grey card help me alot to get the real colors especially when i take pics under LEDs
here are some pics taken with My Nikon D60 and Tamron 90mm Macro lens
GL