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 usbcam but i learned that from ros.org but there still missings.("rosrun usbcam usbcamnode" ) 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