Hi, Candace! You can start by writing down a conversation that you wish you could have with someone, or describe the "scene" of an emotional event in your life. A lot of my songs begin as a single emotion or thought and develop from there. Just begin writing - you can always edit and develop it later! See below for some more resources:
Books on creativity + writing (Camille’s picks):
The War of Art (Steven Pressfield)
The Artist’s Way (Julia Cameron)
Letters to a young poet (Rainer Maria Rilke)
Bird by bird (Anne Lamott)
On writing (Stephen King)
Books on songwriting (The internet’s picks):
Writing down the bones (Natalie Goldberg)
Writing better lyrics (Pat Pattison)
Songwriters on songwriting (Paul Zollo)
Tunesmith: Inside the art of songwriting (Jimmy Webb)
Song building: Mastering lyric writing (Bill O’Hanlon and Marty Dodson)
The Emotion Thesaurus: A Writer's Guide to Character Expression (Becca Puglisi and Angela Ackerman)
The songwriter’s guide to mastering co-writing: Real pros sharing real techniques (Marty Dodson, Clay Mills, Bill O’Hanlon)
Podcasts on songwriting:
https://thesongfoundry.com/songwriting-podcasts/