Identifying what data to collect is an important step in program evaluation.
Now that you have determined what your research questions and your goals and objectives are, you need to figure out how to collect the appropriate data to answer those questions. Of course, what you might discover is that you were a little overly ambitious in your research questions because they require much more data collection than your staff is willing to do. So, this is where you get realistic about identifying what measures you can use or develop and what your timeline will be for collecting data.
You might want to form a committee that will look into some of these issues and report back to the staff at a later meeting where you can discuss your evaluation plan.