If it is a detached home, try modelling it using BEOpt

It will get you a rough estimate of energy consumption very quickly. You could further edit the exported IDF to suite your needs.

Once you are more comfortable with EnergyPlus and results interpretation. Start with a simple model in OpenStudio and slowly build it up.

As you mentioned 462kWh/m2 is high for residential (depends on your climate of course)

ScottB