Starting page numbering on page greater than page #1 in Pages '09
This just worked for me.

Create your you four pages. 

Click on the last page (4) and then 'insert' a section break.

Now with page 5 selected ( click inside page)

Go to the 'Layout inspector' and set it to:



Insert Autopage Numbers. Settings:



You can now insert more pages and the numbers continue.

The first 4 pages have no numbers. And page 5 starts from 1 with the rest continuing on consecutively