Personally, eventhough it's completely up to you, and your tastebuds and needs, I have bought some PG too. Just to bee on the safe side.
when I start mixing (as of tomorrow) I will be making AG from VG diluted with destilled water (I get it for almost nothing at any grocery store here in DK). The ratio is 85% VG and 15% destilled water. That will give you AG with will then be working as your water, when you plot it in to your calculator, which you'll find using this link:http://www.todmuller.com/ejuice/ejuice.php
It will tell you just what you need and how many ml or drops
Hope this helped you a little bit.