Offhand, I can only refer you to sites like Indiamart, justdial, plus real estate portals
like magicbricks. Survey these sites to get an idea of the scope of work you will need
to entice people to register with their service. Also look up the e-commerce websites
across various product categories to get leads into product manufacturers, suppliers, major retailers. Trade bodies like CII, FICCI, Assocham would be another source of leads. Need further info, PM me at ashoklulla at hotmail. com