As you're looking for something reasonably discreet with VV, the Ego Twist or Itaste VV v3.0 are probably your best bet. It's better to have 2 batteries, so you have something to vape on while one is charging, but you could go for a fixed voltage 2nd battery (or 2 Ego Twists, as those are cheaper than the Itaste).
If the protank is too large, the protank mini or the Evod would be ideal, and are perfect for the 2 batteries above. Don't be put off by the low price, both perform well, and it means you can afford a few to have more than one flavour on the go at the same time.
The above tanks are both made by Kanger, so fit the same replacement coils (which you'll need, as coils don't last forever). You may choose to get into recoiling in the future, but replacement heads is the easiest option to start with.
Then a few flavours - personally, I never wanted tobacco flavours, and I find vaping the sweet flavours makes the fags taste pretty awful in comparison, which is a great incentive to stay off them.
Though flavours are very personal, I'd say the bananas/custards/vanillas/caramels seem to be winners with a lot of people.