Do you know if the developer had a local brokerage do the sales for the project you mention? You might want to contact the developer, but I'd also suggest you speak with a Realtor first to get a market analysis for the value of your property. Then decide if you want to put your property on the market or if you want to explore contacting either the developer or the owners of properties adjoining yours to see if there is interest.
I’m sure it could be done. I actually live in a subdivision that started exactly like how you’re describing back in the 70’s. I think it can be a pretty big speculative gamble unless you’re absolutely certain that there’s a huge demand for what you’re creating… but if you end up being right, you could easily make millions (depending on how big of a project you’re looking at).
Your buyer profile can depend on what type of property you are selling, whether the land has been developed already, its location and market conditions, among other criteria. Is your likely buyer an individual looking for a lot for a new home? Or is your buyer going to be a builder or developer looking for land for their next project? Or is your buyer some combination of those, or someone different altogether? There may be different buyers for finished lots, rural acreage or a parcel of suburban land in a thriving new home market.