I am new to macro as well and it certainly presents its own challenges. Lighting is very, very important for macro.
Are you using a DSLR? If so I'd recommend a speedlite flash. You can get them relatively inexpensively on Amazon.
I had to use a flash on all of these because the apertures you typically have to shoot at to get your subject in focus let in very minimal amounts of light. I'm far from an expert, as I said I am new, but these are 3 I am relatively pleased with from this week: