I would get 0 and 12 then you can mix 9 and if you so desire you can eventually lower to 6 or what ever you want. We started on 12 and I have weaned us down to around 7 to 8 and plan on getting to 0 no real time line, but even when we hit 0 I'm not going to stop vaping I like it and it fills the hand to mouth addiction without putting on weight.
Same thing we're doing at my house...