IMO mistake #1 was the 510 PCC kit. A 2X ego type kit can be had cheaper and eliminate the batt problems many encounter. IMO you can avoid mistake #2 and that is instead of pointing people straight to PIF, point then to the new members section and have them read ALL the rules, stickies, etc. that people have put so much time into to help others learn from past mistakes.
Teach a person to be frugal and shop around stock up when items are on sale, they may vape a lifetime. Give them a batt and a bottle of juice and when that's gone they'll probably come to you for another. I believe in the old saying about opinions , that's why I do my best to speak from experience. My experience is that people that have to make sacrifices to vape are the ones more likely to succeed in doing so, the ones that are handed everything to vape with not so much so.
I knew a kid as a teenager that liked to run his Oldsmobile in 1st gear up to 70MPH, he had parents with money that replaced them for him every time he burned one up, he did it time and time again. I had a 69 Mustang and did that one time. I had to pay for and replace it myself, needless to say there is a reason I said one time.
My experience tells me that we can in trying to be helpful actually HINDER one's chances in being a successful vaper, but that's one man's experience. So take it as you will. boB