Here’s your finished file.

Go to File > Print

Make sure the Scale to Fit Media box is checked so everything is on the same page

Then under Printer, select Adobe PDF and hit the print button

This window will appear. Hit Preferences.

The Printing Preferences window will open. Under Default Settings, select PDF/X-1a:2001. Then hit OK and then Print. A dialogue box will open asking you to name your file. Once you do that, the image will print to an 8.5x11 sized PDF file. The end!