I shoot macro with M42 Pentax bellows and enlarging lenses - In my signature is a link to an article on settup. It is great for studio work and dirt cheap.
Off camera flash and some sort of diffusion or light tent will help a lot.
This is an article on cheap manual flash and a diy tent. In stead of building a tent with a box and tissue paper - per the link below - I use white furnace air filters. They have structure and are easy to form into a tent - also dirt cheap.
Strobist: How To: DIY $10 Macro Photo Studio