Welcome to HBT. I'm going to assume that you're asking what to do with it because you're not entirely sure what the Munich extract will do to whatever you brew. Or to put it more clearly you aren't entirely sure what the difference between certain malts is.
With that I'd suggest brewing 2 small batches at whatever gravity you feel comfortable with. Looking at a quick calculator that would be 2.5 or 3 gallons for 1.045-1.055 range. Use the Munich in 1, the Pils in the other. Hop the batches identically, and one pack of yeast (dry or liquid) should be enough to split between the batches as well.
This will give a perfect side by side malt comparison. After some hands on experience and side by side comparisons (drinking each) you'll have a good idea what each one is all about.