From Provape you will need
The Provari in the color you choose
The 18650 extension cap for the Provari
The 6 ml tank
Two
3 ohm cartomizers
From RTD Vapor you will need
The charger of your choice
3 AW brand 18650 IMR 2000 mah batteries
You may also want a plastic case to carry your batteries in for 1.35 I think.
Then I would watch SmokTek.com and Elite Vaporworks . com for more prepunched cartos for your tank at a much lower cost than at Provape.