Continuos Play from Library
 

How do I set my library songs to play fomr one to the next without having to go in a pick the song and launch? In other words if I am working on my computer and just want to listen to every song?

You can only do that using the playlist player. ie: you will need to enqueue them, & also tick the continuous button on the playlist; Playlists & how to create them (click on link)