when i go to turn the key to start my truck it just starts clicking and my lights on my dash and interior lights start flickering? first problem with my xterra so have no clue about it. got work in the morning and im running out of light to work on my truck if anyone has any idea much appreciated!

you probably already fixed it....but in the case you havent...check your battery terminals...they are probably corrodied and need to be either cleaned or replaced...if they arent corrodied, check and see if they are tight.