A first home or starter house is a residential property that is relatively small and inexpensive and bought or built as a first home. Most "starter" homeowners envision eventually upgrading to a larger house in a more desirable neighborhood or school district once they have built equity or otherwise advanced their financial situation.
Useful information: The Brand New House Book, by Katherine Salant (Crown Publishing) is an excellent introduction to the process of building a house. One particularly useful feature is her timeline from idea to completion. More advice is available on her website: www.katherinesalant.com.