Hey there no special process to build template for vCAC, it`s same which you use for vCenter. The agent whcih you installed in the template is actually for vCenter/vSphere environement which is utilised by vCAC to explore vCenter inventory.
If you are not able to see the templates in blueprint defination, you can do manual Discovery/data collection from endpoint-->hover it-->from menu select Data Collection and wait until that finish sucessfully. If it fails, check for errors under vCAC Administrator-->log viewer this will give you complete information about the issue.
Hope this is helpful to you..
Br,
MG