Templates are designed to give us direction, confidence, quality, consistency and save us time. They are checklists. We simply fill in the blanks. Importantly, templates are not straitjackets, but to be useful their format needs to be controlled, otherwise continual local amendments will soon diminish their value. The “owner” of the templates who safeguards their integrity and to whom suggested amendments are made for their improvement, could be the PMO if one is established, otherwise a functional manager might get the job – not necessarily the IT manager.
Some common templates are here for your use, although they may need some modification to better suit your particular needs.