As Bernd said "show me yours and I'll show you mine"
Always find it helps to familiarize my self with a collaborator before agreeing to anything.
I'm a lyricist who always seeking outlets for my words.
However I should point out, I don't write to existing music, I just provide lyrics for music to be written too. So if you can work that way then hopefully we can work on something.
Although I should be able to help complete your half finished lyrics, if you can email me them as documents.
Cheers, Roger