There are two types of bases for the e-juice. Either propolyne glycol or vegetable glycerine. From researching here, I've found its a matter of taste, each have their benefits and drawbacks.
I'm not a veteran, so I'll suggest you go here and watch her videos-
http://www.e-cigarette-forum.com/fo...-videos-newbies-particular-broke-newbies.html
Her videos are short and sweet and to the point. She suggests a 90pg /10vg, if memory serves. She also shows you how to fill your carts, where to find inexpensive supplies and so on.
I just got my PV last night, so I dont have the experience youre looking for, but I've gotten juices from V4L and VoidMist. Both are good with customer service and quick shipping. They both seem very
generous with flavor, but this is going to be a matter of taste, too. However, VoidMist has a 50% coupon that you can re-use, and his prices are VERY reasonable to start with. I got 5 15ml bottles of
ejuice for around $20, including the shipping. When you go to the videos I suggested, you'll see underneath the video box links to places and threads. Look for the MASTER COUPON CODE LIST, thats where you'll find the code for 50% off. I hope this points you in the right direction!