Singer-Songwriter seeks songwriting collaborator, backing musicians (Queens)

I'm a Queens-based singer-songwriter. I often write lyrics and melodies, but I'm not always sure what key my song is in or what chords my melody needs to be set to. I'm looking for somehow who can tell me what chords my acapella songs are in so I can put the musical accompaniment to it. I'm also looking for a musician who's looking to back me up for a live appearance or video performance to be posted to social media.