Help with MFLB technique

I got my first MFLB about a week ago, which is the first vape I ever used. I'm loving it so far, but I just am a total noob with using it. Youtube videos have only been so helpful. A few specific questions I have are:

• Should I be able to see vapor when I exhale?
• What does vapor even look like? Smell like?
• How do I know if I get smoke or vapor?
• I noticed a little hole on the back side. Is that a carb? Do I use it just as I would a pipe?
• How hot should the air be?
• I know it's hard to quantify the temperature, but what can it be compared to? How hard do I need to inhale? Do I need to vary my inhalation strength at different stages in the hit?

I'm sure a lot of this is common sense for you guys, but common sense isn't exactly common. Help a fellow Ent out here? =D <3