@Chris Wierman
If the zoning is already setup for you, that is great news. The hardest part can be rezoning property to something other than what it's currently zoned because you never know what kind of feedback you'll get.
With that said, the best, easiest option for you is to take it to a civil engineering company to subdivide the property such that it meets local zoning requirements and to figure out how to protect the wetlands. It's likely that a stormwater pond system will need to be implemented to clean the stormwater before it works its way into the wetland.
This will cost you some money, probably to the tune of $50k+. The next step would be to build the improvements - grading the site, putting in the roads, putting in the sewer, water, and electric such that houses/duplexed/industrial can be developed on the property. This is expensive and is probably where you are going to want to stop. But maybe not. If you own the property free and clear, you could take out a loan against the future worth of the property to do the work.
The catch is that if the market stagnates and you can't sell the lots, you're stuck with the developing costs, whatever they may be. As @Tim Swierczek and @John Woodrich mentioned, the best way to get you to the next level in value is to do the subdividing and sell it to a developer who's going to do the roads and utilities. But you won't get the finished lot price, you will get the subdivided price.
Price difference:
Raw land - $8-12k/acre
Subdivided Land - $25-30k/acre
Fully Developed Lot - $150-195k/acre (3 - $50-65k lots per acre) - Retail price
But if you develop the land, you can sell 3-4 lots to each of 15 builders or all of them to one builder. That helps diversify but I wouldn't go into the full scale development until you had a commitment from enough builder to at least break even on the project.
Now, let's say the economy tanks and you can't give away the property after you subdivide the land? I'm hoping that you could take out a mortgage on the property for $50k for the engineering and if you had to sit on the property, you could at least farm it (or rent it out to a farmer) to make enough to cover the loan payments on $50k while you wait for an upswing. Then, when the economy comes back, you would have some of the first lots available to be able to sell to builders. You'd have to run the numbers to decide whether you are comfortable with that, though.
Using some rough numbers, assuming the property is relatively flat, here are the costs for full development (at least in order of magnitude):
Engineering: $65K
Grading: $1.25M (stormwater ponds and road grading can get pricey)
Roads: $1.25M ($1M per mile of roads - 1.25 miles estimated)
Utilities: $200K
Land: $400K
All in: $3.165M
Developed properties: 25 acres (3 acres set aside for parks/paths/etc.) x 3 lots per acre = 75 lots. 75 lots x $50-65k per lot = $3.750M- 4.875M.
I might be heavy on the grading and light on the price per lot but this gives you some indication of the numbers. I think it's no secret why big developers (Pulte, DRHorton, Lennar) are doing their own property development. They can make a little margin on the lots and then more margin on the homes. They certainly aren't buying lots for retail and you probably shouldn't expect to sell them retail either.
Feel free to DM me if you have additional questions.