I'm going on month 2 with my Riva kit and I love it!!! Im still a newbie.. how do I use the blank cartridges that came in the kit?? And I'm finding myself constantly vaping and having a hard time finding a level that feels right. I've bought a ton of flavors and try mixing but never satisfied. Thinking about making my own but where do I begin?? I hate the thought that I wasted a bunch of $$ on the flavors I already have.. should I start with those and mix with concentrates?? I really have no idea and hope I don't sound ridiculous but that's why I'm here.