Make sure before you do anything that zoning will allow you to use the property the way you want to. Often rv's can only be on property a certain number of days at a time. Other areas are stick built homes only. Availability of Sewer/water/electricity from local sources is probably the first question. If water is available locally then it comes down to the cost to install the line and a meter. If public water is not available then your only other option is to drill a well. Is a public sewer available? If not then installation of a legal septic system can be somewhat expensive but a better option than driving somewhere every two or three days to dump. Next there is electric. Bringing in power and installing a temp pole with a meter can be expensive. We have been through this twice in the last 15 or so years and it was not cheap. That being said when we sold the developed property we recovered our monies and then some.