Welcome back! 49s play Mondays, Thursdays and Saturdays starting 10pm EST/7pm PST. Enhancement shamans do decently enough, rogues hit hard, and holy paladins are arguably the best healers in the bracket right now thanks to their survivability.
49s have tremendous burst -- a fully geared 49 can die in two globals, which makes for intense games. The bracket is not a walk in the park, by any means. While gearing up a 49 can be a lot of work compared to other brackets, the community is very helpful toward that end. Check out the WoW 49s thread for more info:
49s: Mon/Thurs/Sat 10pm EST/7pm PST - Forums - World of Warcraft