Mike and Heather and I rapped once or twice in New York and then we all wound up on a train together on the way out to Maryland. I think it was about a month and a half from the time we got cast until the time we shot the thing.
The first thing I do when I read a part is see if I can identify emotionally with a character. If I make that connection, everything else is just working on knowing their life circumstances and manifesting those through practice and research.