transferring songs to itunes

Is there a way to automatically send the songs I download into the itunes library without having to drag them from the Limewire folder in the hard drive? I am not sure but I think if I play a song when other songs are downloading it causes a problem with the songs downloading. Has any one else had this problem? Is quicktime the device that should be playing the songs? Sometimes itunes opens up and I lose the songs I am downloading.