OK, I may seem retarded, but:

Is the effects loop on the back of my amp used for my Vox Wah, Boss Metal Zone, and Boss Flanger pedals, or is it for something else? I am presuming that this 'effects loop' is for that loop of pedals, and then I plug my guitar straight into the amp ... correct???
"The road ahead is lined with broken dreams, so walk, just walk on by..."
The effects loop puts them in after the preamp. Some effects sound better there some sound better out in front. you'll just have to experiment to find out which you like where
The flanger would go well in the loop. But in my experience, distortions and wahs are best in front.
These go to eleven...