When writing lyrics, did you first try to find rhyming-words or meaning?

I am natural in composing/writing the music, but not that good in writing lyrics. But I’m currently learning on that.
If any of you write lyrics, which one did you usually do first?
is it trying to find rhyming words (ie: first browse through the thesaurus dictionary), or just first write WHATEVER comes into your mind (ie: meaning comes 1st, from your very deepest heart), and then later on, you edit the words so they rhyme, and also arrange the structure of the verse, chorus, bridge?

I’m basically confused which thing I should do first, step by step, until the lyrics is finished.
Need help on this one, thanks!