1) Google "New Homes for sale, Garland, Texas". The search results should provide you with examples of different homes, and perhaps you'll find a home that offers the features and finishes you have in mind?
2) Go to Trulia.com or Zillow.com, then search for homes in Garland, Texas. Both Trulia and Zillow provide an estimated price, and also a estimated cost per-square-foot.
That's probably the easiest way to get an idea of the price-per-square-foot in Garland, Texas.