Before making pdfs be sure all your photo files are at the proper resolution and are CMYK. See link.
1. Go to the Edit Menu and select Output styles.2. Select New then PDF.
PDF Style: (name it) "magazine"
3. Click the Pages selection.
check "Export pages as seperate PDFs"
uncheck "include blank pages"
check "Embed Thumbnail" and choose "color thumbnail"
4. Click the Meta Data selection.
clear all fields
5. Click the Hyperlinks selection.
uncheck "include Hyperlinks"
6. Click the Compression selection.
Set all Compression to "None"
Set all Resolution to "Keep Resolution"
check "Compress Text and Line Art
uncheck "ASCII format"
7. Click the Color selection.
set Mode to "Composite"
set Setup to "As Is"
8. Click the Fonts selection.
check "Download all Fonts"
9. Click the Marks selection.
set Mode to "centered"
set Width to ".003"
set Lenth to ".25"
set Offset to "0.167"
10. Click the Bleed selection.
set Bleed Type to "symmetric"
set Amount to 0.125"
check "Clip at Bleed Edge"
11. Click the Transparency selection.
set Transparency Flatting Resolution to "2540dpi"
uncheck "Ignore Transparency Flattening"
12. Click the OPI selection.
uncheck "OPI Active"
13. Click the JDF selection.
uncheck "Output JDF"
hit OK
in the Output Styles window: hit Save