Setting default contents for editor

All you need to do is, just before you create your editor, assign an HTML string to the 'Value' property. An example is as follows:

<script type="text/javascript">
oFCKeditor = new FCKeditor('FCKeditor1');
oFCKeditor.BasePath = "/fckeditor/";
oFCKeditor.Value = "<p>This is the initial value of the editor.</p>";
oFCKeditor.Create();
</script>

Incidentally, you can also set the toolbar at creation as well, using
oFCKeditor.ToolbarSet = "Basic";