when I get to the end of a phrase - I need to start the next phrase on a new line - how can I do that?
At this time (although it is on several wish lists) you can't force an end of line. So you have to juggle the line lengths by padding the text and altering the font sizes and margins. You should have a look at https://forum.noteworthycomposer.com/?topic=877 , https://forum.noteworthycomposer.com/?topic=732 and earlier links from those threads.
Hope this helps, Peter.