The best place to list free classified ads these days is craigslist.org and backpage.com These are simple no-nonsense interface sites where you can list the property price, description and add images. The big drawback is you have to continue to edit and update your listing to stay on top of the listing system otherwise it will be more difficult for buyers to find you. You can learn more about how to do this through basic Google searches.
Especially when I'm buying vacant land out-of-state, my first line of business is to understand the topography of the property. There are many, many places around the world that have very unpredictable elevations, cliffs, mountains, valleys, ravines and more. In many cases, the topography of the land can have a huge impact on the build-ability of a property. For the same reasons you can't build a house on 90-degree cliff, you should be doing some preliminary research to find out where your property is located, and what the lay of the land is.
As for whether the seller will accept a lower offer – you’ll never know until you make the offer and wait for his response. It could obviously go either way, but my philosophy is usually to err on the lower side – because unless he’s got other buyers waiting in line (which I doubt he does), you can always come back with a higher offer later if you really want it that badly.
The last option is to call a company like mine and field an offer. We will do all the research and make an offer (typically below market value so we can make money) and pay all the fees. If you are looking for quick and easy this option might work for you. Try it on your own first though as it's a fun process and you'll exercise a bunch of brain muscles in new ways. Good luck and feel free to contact me with your questions for a free 20-minute land coaching consultation.
If you need to find a buyer fast, our company is in the land buying business. If you've got time to wait for a few months, then get it posted on your standard online sites (don't underestimate Craigslist!) and consider hiring an agent. If that doesn't work out or you don't feel like waiting, we've got a network of buyers at Landmark Property Buyers.
Consider your own needs when pricing, and understand how pricing could impact buyers’ interest. When selling real estate, you sometimes have to choose between getting the highest price and possibly selling quicker. Plus, your pricing may be influenced if you need to sell for financial reasons. In addition to your own situation, pricing your property ultimately requires an understanding of the land market as a whole, why people are buying lots or land in that area and who these people are. A good real estate agent with land expertise can help greatly in this process.