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1. File-> Place, Tick the box of Show Import Options, Select the PDF file, click Open.
2. On the place image window, choose pages "All".
3. Click on the upper left corner of each page in order to place the PDF pages.
4. Once all the pages are placed in order. File -> Save. 
5. Window -> Layers, at the lower right corner of Layers panel, click on Create New Layer and name it"text". The PDF file is on layer 1. We will add text to this newly created layer text. 
   Make sure the text layer is selected when you are adding text.
6.  You can use Type tool to add text.
7. Step-by-step instructions on creating speech bubbles on creating call-out box or cloud shape in InDesign.
8. Sample bubbles in InDesign file created by the DMC; sample bubbles in PDF file created by the DMC.
9. Sample bubbles in Illustrator file.
10. File-> Save to save your work in .indd format constantly while you are working on the project.
11. Once finished, go to File-> Export, Adobe PDF (Print)
    Note: if you need to move your work from one station to another station, go to File -> Package, then move the whole packaged folder to another station. 

References

1. Creating Auto-Size Speech Bubbles

   http://indesignsecrets.com/creating-auto-size-speech-bubbles.php

2. Get Creative with Vector Speech and Thought Bubbles
   http://creativepro.com/get-creative-vector-speech-and-thought-bubbles/

3. Quick Tip: Create a Speech Bubbles Set with the Appearance Panel
   http://design.tutsplus.com/tutorials/quick-tip-create-a-speech-bubbles-set-with-the-appearance-panel--vector-5065