Forget about using your municipality to obtain a water report. Although they are required to give you one upon request, their numbers are usually inaccurate and they don't typically contain all of the ion levels that a homebrewer requires.
Contact Ward Labs
and spend the $16.50 for the W-6 Household Mineral Test, or the W-5 test for $10 more if you have concerns about iron and fluoride. This will tell you everything that you need to know about what's in your water.
As far as understanding what you are looking at, check out the chapter in "How to Brew" on Understanding Mash pH
. This should give you a good foundation of knowledge to build on as you go forward.