An experienced builder will not only help with the floor plan but they will also help with the orientation of the home on the land.
Weather and sun exposure, daylight basements, ledgy and most areas, drainage, driveway placement all need to be considered and will help in resale down the road......
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You may want to consider the direction to face your windows for the most solar gain. Not quite due South in Maine.
Remember that your builder will cut down trees for the foundation, driveway and the septic , so it will open up the woods. Also if you can , you want the septic field to be down hill so you do not need to pump your septic tank. The septic design will also help you locate your house on the lot.