Virtual land sale as a fundraiser

Hello, I work for an environmetal/wildlife organisation. We recently opened a new wildlife enclosure for an endangered species which links in with a project we run and fund overseas. I thought it would be a good idea to have a virtual land sale so that local companies could buy a virtual plot of land to 'virtually' improve the habitat and stop the decrease of the species' population.
Does anyone have any experience or knowledge of this? Not sure where to start.
Thanks in advance.