Advice for a birthing helper?

One of my closest friends is due to have her first child fairly soon. She’s single, and has said she’d like me to be with her when she gives birth. I am so honored and would love to be as helpful and supportive as possible. I don’t have kids, nor do any of my other close friends. I’m unable to attend birthing classes with her due to a scheduling conflict.

For those of you who have been a birthing coach/helper or who have had children, what advice can you give me?