We're starting out at nearly the same point. I just got my kgo (riva) today and it's on the charger. It didn't include any instructions, so I'm hoping the light turns green when it's charged. Right now it's red and blinking. I'm getting ready to search out some vids on how to fill the cartos etc. So if all goes well I'll be vaping sometime later tonite.
I obviously don't know anything about juice, but phil busardo (among others) does great juice review videos.
TasteYourJuice.com Obviously taste is subjective, but he tells you what he gets and doesn't get from the juice. Kind of helps you decide if it's one you'd like to try. I've bought mine in 70pg/30vg since many seem to feel that's the best combo for not clogging and getting good taste and good vapor. Good luck to both of us!!