Duplex Development - Help w figuring raw land development costs?

[Shane H.]

Hello - I'm not a newb, jack of all trades master of none.

I have a piece of land (18 acres) identified near me and believe after much observation, networking and general market observations there is a definite need in our market for more duplexes/townhomes -- I've got a rough game plan of how to develop the property but where I'm struggling without bugging contractors is some sort of resource or hey if you've personally done this and can find time in your day to spend 5-10 mins for a quick phone call would be eternally grateful.

Having a hard time spitballing the development costs for the infrastructure.

Sewer main extension, water main extension, installing the roads (Would do appx 350-500' of road with a culdesac to start.   Enough to carve out 6-10 duplex lots.

Dont know if that's enough information for someone to possibly chime in or point to a resource - and I realize how you have to build the road, sewer main specs etc are likely going to be somewhat different depending on the locale.  NE KS area is where I want to do this at.  

 Also I will need to call to the city - but they will place specials on the lots - however what is not clear to me if the developer fronts the costs for all the infrastructure then the city takes out a bond and pays back the developer once specials are levied or the exact flow of how that works.  

TIA -- I'd be glad to offer up anything I can share about assisted living in exchange.  Building my own development has been a vision I've held in my head for years and I want to see it through.  I dont know why I can't do it and make it happen.