If the pg/vg ratio is not listed on your bottle of eliquid, you can try contacting the vendor that you buy it from to ask what the pg/vg ratio is. I have done this a few times, with several vendors, and found that the vendors are usually quite willing to let me know the pg/vg ratio.
I just ordered the Subox Mini kit for my daughter's boyfriend, and am waiting to put in an eliquid order until I can get feedback from him and my daughter (I got her the Innokin VV V3) to see if I need to change pg/vg ratios and/or nicotine levels. The boyfriend usually vapes 0 nicotine, my daughter usually uses 18 mg nicotine. I usually try to order 50/50 pg/vg, but there are a couple of vendors that we enjoy that sell 60 vg/40 pg or 70 vg/30 pg. My daughter and her boyfriend got me a CoolFire 4 (I have to wait till Christmas to try it) and some eliquid at 6 mg nicotine (I usually vape 12 on my Kanger Evod 650 mah battery with Evod Glass clearo and 1.5 or 1.8 ohm dual coils.
You may need to do some experimenting until you find what works for you. When we switched from cigalikes to Evods, we had to cut way back on the pg before we got to the "sweet spot" for us. The higher pg that was fine for us with the cigalike cartos was much too harsh for us with the Evods. When we switched from using Kanger single coils to Kanger dual coils with our Evod Glass clearos, I was constantly bugging my daughter to let me know how things were going, in case any adjustments in nicotine or pg/vg needed to be made.
The time between Christmas and New Year's will be another one of those times when I am bugging the heck out of both of them, and myself, to see if I need to make any adjustments before I order eliquid, since we all have new equipment for the holidays.
I hope you enjoy your new equipment and find the "sweet spot" for you as far as eliquid is concerned.