Normally, you don't have the well & septic until your building plans are known to determine what size is required. What you want to know is if a perk test has been done, to show that the property can support a septic system. Wells vary in cost depending on the depth required. Are you planning to build, or place a mobile home? Which area of central Virginia are you thinking of. Prices for an acre lot will depend on the county & distance from Richmond you are looking.