You can easily insert a page number field in the footer of your document. You can also add a page count to the footer, for example, in the form "Page 9 of 12"
Choose Insert - Header and Footer - Footer and select the page style that you want to add the footer to.
If you want, you can align the Page Number field as you would text.
Click in front of the Page Number field and type "Page ", click after the field, enter a space and then type "of ".