Hey guys! Thinking about getting an MFLB and had a few questions.

So as the title says I am thinking about purchasing my first MFLB. I just had some general questions about where to buy it, how much it costs, and how to hit it properly. First two questions are pretty straightforward! How to properly vape with the MFLB puzzles me. I have seen tutorials on YouTube where I see a guy do "fish kisses" and I've also seen people pull through like hitting a joint or piece. Which is correct and do you guys have any other pointers? Thank you all and happy toking!