Congratulations on your new D700. When you get the camera, open the D700 Menu Items and Settings Spreadsheet thread pinned at the top of the D700 page and go through the settings one by one. Keep in mind the D700 has 4 shooting banks and 4 custom settings banks which allow you to quickly reconfigure the camera settings for different subjects and conditions.
Since you are buying a used camera make sure to change the Copyright info and the Image Comments before shooting your first image.
Once you have the camera set up go out and shoot. There is no substitute for experience. Good Luck and Enjoy your Nikons!