Hey there and welcome Shadow!
Oshawott is a pretty good choice, he is my favorite of the Unova starters, plus his final evolution is awesome and has a super cool design :D I Hope you'll have fun playing the game, Black2 and White2 are incredibly well done and have a huge amount of post-game stuff to do! If you ever need anything, just ask another member, we all love to help out and to chat :D
Looking forward to see you around!! (: