For anybody who is not mixing and reads this far, consider some additional points. If you don't feel ready to mix consider putting a liter or two of nic in the freezer in case of government interference. A one liter bottle of 10% nic from a vendor like myfreedomsmokes costs $50 (add another $10 for amber glass storage bottles) and has the same amount of nic as the smoke of 5,000 packs of cigarettes. (In michigan 5,000 packs of cigs costs about $30,000.) For at least the next 10 years I won't be paying any smoking taxes or buying mystery juice from vape shops.
The easiest way to get started is mix unflavored, PG, VG, and nic, and use it to dilute the flavoring in pre mix you know you like. I find pre mix tastes better diluted 25/75. I find undiluted commercial liquid to be overpowering.