Photography
Do not waste time taking endless photographs of your work, hoping that some will be presentable. In the long term, poor presentation material will lose you opportunities and money. A body of work takes a huge amount of time and effort - invest in having a professional photographer take high quality digital recordings that can be turned into slide transparencies or colour photographs of the work if necessary (if you are on a budget, a photography student may be prepared to do this as a course project, charging only for materials, or another artist friend may help). In order to attract dealers, gain exhibitions and develop good quality promotional material it is essential that you have the best quality images possible in all formats.
For more information about creating your own portfolio, see the Art Support website. Artquest also lists useful contacts for making portfolios in the Presentation and documentation section.