there's architects and home designers who can design a plan fro you and there are also numerous companies that build homes from their own plans and also modify their plans to suit your specific needs ..depending on where you live there are also some building companies that build display homes, open for inspection, to show what they can build on your land and the homes can be modified to suit your needs....all these companies have websites with dozens of home plans to research your ideas but a visit to a display centre eg Homeworld in Kellyville Sydney to inspect suitable houses where there are sales assistants on site who can answer your questions and of course once you have some basic designs there's always HOUZZERS to add their contributions