First period:

For the 9 of you who actually downloaded and attempted the homework, I appreciate your diligence.  Here are some resources for you.

First μ is a prefix meaning micro, or 10^-6.  So when you see 5.7μC, we’re talking about 5.7*10^-6 coulombs

Hyper Physics Coulomb Force Calculator

For an Electric Field calculation, Q2 is usually just a single electron, or a single proton.  Use the calculator above, then divide the answer you get by the charge of that single electron.