You don't need a template per se. At least not a purchased one. You'll make one in InDesign. Look up data merge in the help. It will do all you need for getting the data into ID.
If you have never used InDesign, be prepared for a somewhat steep learning curve. You can do lessons from /www.lynda.com, and there are good books if you woud like. Sandee Cohen's book is oft recommended:
And of course, once you get started, ask here for specific help.