Red Superfly
You creepy little stalker
Make some ideas for a song, practise a bit, do a jam session.
Songs, especially things that I come up with, just tend to evolve. First I get a basic structure, then I add meat to the bones. Sometimes I just jam a complete song at random and tweak it accordingly.
As for writing songs, read poetry and just have a strong vocabulary. I always aim to try and stretch beyond normal phrases and words, and not use "obvious" rhyming words (unless the song tone suits simplistic rhyming). Lyrics, in my opinion, need to sound natural, not written. If a rhyme sounds at all forced, scrap it. Develop a strong sense of how phonetic psychology is used aswell - be creative with vowels. I love to be surprised and awestruck by lyrics, and I like to reflect that back into the things I create.
Don't, for the love of God, have lyrics like:
"I went here, I did this, you weren't there
You said you were washing your hair
You dumped me, yes you dumped me
Waaaaaaaaaaaah wah wah
I hate my mum, I hate my dad
Because I got dumped. My name's Brad
I like to wear trucker hats to impress the girls
Waaaaaaaaaaaah wah wah
I use words like phonograph
Personify and epitaph
Because long and grown up words are kewl
Waaaaaaaaaaah wah wah"
Avoid the above example of cliche, unless you want your fanbase to be 12 year old girls or it's a parody.
It just happens. Stretch out with your feelings (Alec Guiness lol) and take it naturally.