>>127144347 (OP)If you have the music, start with nonsense words that fit the syllables "cauliflower", "scrambled eggs", etc.
Then you find some single line that works as a hook.
You build a theme around that line
Then you add ambiguities, double entendres until there is something interesting about almost every line
Here's a really good pop lyric, that is still keeping things simple: https://www.youtube.com/watch?v=c50DPr1KM88