Have you approached syndicates such as Shutterstock? Google the web address (can't give you it here). Another option is to borrow a copy of the Artists' & Writers' Yearbook for agents and other bodies who would represent you. Look into artists' copyrights. Get a portfolio together to show potential clients. when you're established you might specialise in one particular genre of photography that reflects your personal interests. There will be enough takers for specialist image-makers. You could even invest in a Windows graphics software to 'enhance' images for commercial purposes (e.g., illustration, book covers etc).