ar_sys how to run Help !!! [closed]

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hi i am new use on ROS. i wanna run ar_sys package but i miss something when i try it . i need help about that someone will help me step by step.

For example normally i couldn't run usb_cam but i learned that from ros.org but there still missings.("rosrun usb_cam usb_cam_node" ) i still cant see my webcam visions.(it definition webcam but there is no vision or pic.)

so i need help for that who someone can explain every thing step by step. with mail. or fcebook. or hangsout.

Thanks... my system is 14.04 / ros indigo