I'm going to pick Tepig, purely because I want my Rival to have a Samurott. (After seeing the anime trailer, that's the way it has to be, hahaha). However, I picked Tepig in my first White playthrough, and so.. I don't want my team to end up being a duplicate of that one.
So I'll pick Tepig, but I'll put him in the box (in a kind way... :P), and I hope to have a team primarily consisting of non-Unova Pokemon, such as Riolu, Arcanine, Lapras, and.. I haven't decided on the others yet, but there's plenty to choose from. I just hope they'll be available reasonably early in the game so I can have my dream team by the end of the game.
I won't be looking up any walkthroughs or guides. I've seen some videos on YouTube, but I haven't seen anything major in the story as such, so it'll still be a surprise. I guess I MIGHT use an online Pokedex to find out where Pokemon are/if I can actually get certain Pokemon in White 2. It'll be a standard playthrough for me, aside from the fact that I won't be using my starter, which is something I've never done before.