Play around with python and/or numpy for this (lots of tutorials online) for slurping data from a text file and processing it to generate those summaries. Start playing around with this to get the basics of the language, writing functions, conditional logic and loops.
Hell, you could even play with programming macros in Excel (not my preference, but it is readily available in most offices, and, if like mine, you'll have lots of reports in Excel already). The point here is not to pick you favorite or final language, but to get some practice with manipulating data, consuming input, producing output, and using logic effectively.
My friend's learning from the ground-up and he's using Code Academy (https://www.codecademy.com). If you're a little more serious about this, you could also look into Udacity's Nanodegree program.
It's how I started learning when I was trying to do it around my job, I eventually left to work on learning to code full time.
Looks at the example projects made, the reviews from the students. If any seem interesting then just dive right in.