The "junk" on the main screen you cant get rid of:
CNN, Fandango, the weather channel, ect. they are all weblinks to install the apps they link to. You will just have to hide them.
As of the preinstaleld games, or other "junk", goto:
scroll down to find the target app
use the left BB button to bring up options
Reboot when your finished removing your unwanted apps.