[Word 2005] Open in Preview EASY

ya its problably pretty easy but how do you make a microsoft document open in print preview.. or in READ mode, i remember before that i used to be able to set some setting to make the doc open in READ only mode. but i dont remember and in addition i need it to just open in read or print preview , and if i want to edit it. i just close the READ mode or Print preview... its very simplistic i just dont know where to find the stupid check box.. sorry for all this writing.. :D