Well welcome back!
To start off, I definitely recommend playing Black or White before getting Black or White 2.
It is a sequel you see, not just a remake like Platinum was of Diamond and Pearl. Black and White are fun games, and you should give them a go. Personally, I thought the storyline was quite touching and innovative, especially for the Pokemon series. It deviated from the same old-same old feeling. I strongly recommend playing them.
Now your question is about transferring Pokemon from Black/White to Black2/White2- I believe this is done through trading. So, alas, you may need two gaming consoles :/ Sorry if this is bad news for you. There have been methods in the past that have only required one DS, but I don't believe those methods are available this generation. However, I am not sure as I believe there are at least 2 methods of transferring. One being standard trading, and one other which I cannot remember because I have gotten no sleep..
Sorry if that last part didn't help much. But definitely play Black and White, you will enjoy it. And (apparently the sequels are much more enjoyable if you played Black or White first). I am waiting for the English version.
All in all, welcome back and GO GET BLACK OR WHITE!