You need to add your six unnumbered pages to the start of the file, then in the Pages Panel right-click on page 7 and choose Numbering and Section Options...
Start a new section and set the start number to 1. When you say OK, ID will complain the number is in use, so say OK, then right -click on the very first page, go back to the numbering and section options, and change the numbering STYLE to anything other than 1,2,3...
Traditionally "front matter" is numbered using small roman numerals, so you might want to choose that style. If you want no number to appear on those pages you should create a master page without page numbers to apply to them.
Ok I figured out I could right click on the first page (7) and choose Insert pages…I inserted 6 pages before page 7 and applied a master of None.
That seems to have done the trick.