You don't place houses. You lay streets, run power, water and waste collection out to the land, and mark which land is for homes, shops or factories. People arrive along the highway and build on any serviced lot they can reach.
Tip: rest the mouse on a tool, a number or a bar for a short explanation.
Pick a difficulty preset, or move any slider yourself — the preset just fills them in.
Leave blank for a random map, or type a number to get the exact same terrain as a previous game — useful for comparing scores fairly.