I recommend buying the smallest available bottles from 3-4 vendors right away and mixing them unflavored at your preferred strength. Unflavored actually has a "flavor" and it's usually pretty pleasant on its own. Once you narrow down your preferred "taste" and throat hit then you know you have a winner for your recipes.
A few of the many options out there:
Cleanest, smoothest, and more expensive: VapersTek and Nude
Budget but pretty good: Myfreedomsmokes, Heartland, NicRiver (they resell Alchem's NicSelect and many other vendors like E Cig Express sell the exact same thing but different labels)
Don't burying yourself reading too much. Just buy some small bottles and test what you like. It's faster and more efficient. It's also not very expensive. I recently tested NicRiver/NicSelect. Got a 60ml bottle shipped for 10 bucks.