When my friends visited me in 2012 they were coming up to a year free of cigarettes, by the miracle of vaping. They offered to buy me a kit, but if I failed I didn't want them to bear the cost. What I did was buy exactly what they were using at the time:
A pair of the earliest ego-T batteries, one for my mouth, one for the recharger
Recharging cable and wall wart
A pair of the plastic "Stardust" clearomizers
A 30 ml. bottle of his flavor (his custom tobacco flavor blend) and a 30 ml. bottle of her flavor, strawberry (the strawberry was awful).
It was primitive, basic, expensive at the time (though you can now get those old ego-T for less than 5 bucks apiece), but it worked, made me love vaping, propelled me toward choosing a quit day, which I did. I had my last cigarette the Sunday after Thanksgiving 2012. Quit day was rough, but I never again craved cigarettes after that.