If I am not mistaken, you just bought a D5000, yes?
If so, you need to know that certain 50mm primes won't autofocus on the camera body. The 50mm 1.4 AF-S G will; the 50mm 1.4 AF D won't.
Basically anything with AF-S in the lens name will autofocus; anything without it won't.
As for the choices between 50mm and 35mm--on a crop body I loved my 35mm 1.8.
Truly though, you might want to get used to the kit lens a bit first, then figure out which focal length would be best for what you shoot.