If you want to investigate the situation on your property, you could always order an environmental report. They can either do a high-level look at it (without doing any soil sampling), or they can drill soil borings to verify if there are any chemicals in the soil (which of course, will cost more). I’m guessing you could find out more on whether or not it’s an issue to be concerned about with a quick phone conversation.
Before getting started, check out a few sample ads for houses and you'll notice that they are emphasizing the benefits and amenities of the house. Don't sell the steak, sell the sizzle. Raw land is no different. Take a good look at what makes your land compelling. Mountain views? Water? Hunting? Recreational area? Good access? In the path of development? Trees? Then get out the thesaurus and use some colorful adjectives to describe the area and land. Of course, you will need a section for just the facts such as: elevation, access, terrain, deed conveyance, taxes, driving directions, GPS coordinates, sewer, water, utilities, mineral rights, etc. I like to use a simple table outlining all of the basic attributes and facts about the land. It is essential that the potential buyer have easy access to this basic information but it won't help sell the land. Your language and conviction about the area need to be conveyed to a potential buyer and that is what will sell the property. More information is always better than less. Once you have your content well laid out then you need to add images.
Hire an appraiser to determine the value of your land if you don't have the market knowledge to do it yourself. Without knowing what your land is worth, it will be hard for you to assess the strength of the offers that you receive. The appraisal will also determine the highest and best use of the land, and you can use that information to target your marketing activities.
First impressions are lasting in real estate. When selling a home you would never leave out your dirty laundry for potential buyers to see, and you should also clean up your lot before it is shown and marketed. Cut the grass (or weeds), remove trash and take marketing photos of your property when it is looking its best. Some sellers even plant wildflowers to make their vacant land look beautiful. It’s like staging a home, but you’re just working with raw land instead.