Hi Lamar,
I have yet not seen any 'Fill-in-the'blanks' templates for developing message flows for the Integration Bus.
But IIB comes with a number of tutorials, which are available from the 'Getting Started' panel in IIB, and a number of patterns for developing new solutions which you can find you can find e.g. here:
https://www.ibm.com/support/knowledgecenter/en/SSMKHH_9.0.0/com.ibm.etools.mft.doc/ac68260_.htm
You may find more tutorials in IBM Knowledge Center but loading these into IIBv10 is somewhat difficult.
Best of luck with studying these sources.