For tons of posts about the Wow juice, it's good to be in the vapor4life forum here at ECF.  Wowbacco to me is really nice and much like a Marbolo light.  I also like menthol, but it's not available in Wow, at least not now.  They also sell prefilled cartomizers (vk or k808 type), but I presently just fill my own.  Many people do like to buy them prefilled tho.  The VK/K808 cartomizers can also run on egos and the Hello016, which are 510 thread types.  Order you some adaptors to and from 510 also.
For nicotine strength, if you are a serious smoker, it may take 24mg and 36mg at times.  Some people get a high strength and a bottle of 0 or low strength, and then combine the two as needed.  
It may be necessary to order from more than 1 or two suppliers, to ultimately build your own kit customized to what you need, and to find all the things you need in stock, but the Wow juice I really recommend because of it's highly realistic smoke appearance.  On a scale of 1 to 10 for vapor quality and production, I rate it a 10.1  
Flavors are a different subject, and lots of suppliers have great flavors. I just happened to have reached a point when I was not very satisfied with poor vapor production, but vapor4life's Wow line too care of that.
But anyway, good luck, and welcome to ECF, it's a really big super forum and hopefully it will help a lot.