Atra du evarinya ono varda.
I personally think that it would be a good foundation to start off with B/W first, followed by B/W2. The storyline in B/W2 is continued from B/W, so you might end up a little lost if you begin with B/W2. You could read the synopsis for the earlier game first, but I find it better to experience the whole adventure for yourself, only then will the second adventure mean much more to you. This is what I think and recommend, but you are free to decide for yourself. :) All the best in your journey and may you be the best there ever was! *thumbs up*