Original response edited out.... question modified to a more appropriate form
Better.
Have you examined cursors yet? and writing geometries Writing geometries—Help | ArcGIS for Desktop
Are there any tools that you can use in Arctoolbox that you would use in a manual process? like
Adding x,y coordinate data as a layer—Help | ArcGIS for Desktop
Think of how you would do this manually, then examine the code snippets in the help files.
Now that is an appropriate question