Writing - Lyrics V Instrumental

LastMantra

Most of us could come up with guitar parts because we're doing it all the time and have a bunch of licks and riffs and stuff to draw from. Songwriters are the same but with words. Rappers, for example, can improvise rhymes because they're thinking about lyrics and practice constantly from the moment they get up in the morning to last thing at night. 

I noticed, on places like soundcloud, that lots of guitarists practice guitar parts till they get it perfect but then seem to think they should be able to sing and come up with cool lyrics to put on top without practicing at all. Like the words should appear out of nowhere. 
If you want to get good at something immerse yourself in it. 
Keep a note pad handy and write any words, sayings other lyrics, anything you like the sound of. 

There's no right or wrong either. Look at bowie cutting lines up and mixing them round. 

duotone

I read this last year on Reddit & found it to be useful.
https://www.reddit.com/r/WeAreTheMusicMakers/comments/kdz55l/songwriting_exercises/
  Hope it helps you