#1
As you can tell by my gear I am somewhat new to guitar, but I must ask...

since the Marshall Haze has no "FX Loop", does that mean I cannot use effect pedals such as the Boss ME-20 I'm getting for my birthday? if not, then what DOES it mean? Thx in advance, I was just thinking about saving up for a Haze Full Stack as my first Tube Stack until I saw that.
#5
An effects loop is in between the preamp and power amp, so any effects there affect the distorted (or clean) signal coming from the preamp.
You can still use the ME-20, the effects loop is only there because some effects (Modulation or time based effects; delay, phasers, flanger, chorus) sound better when applied after the preamp.