In what cases is Botox most recommended?

I am looking into Botox because I am more self-conscious than before about the expression lines that appear between my eyebrows and on my forehead whenever I take photos. They don't seem to be deeply ingrained yet, but I was wondering if I would still be a suitable candidate for Botox at this stage. In particular, I would like to know if the approach differs for wrinkles that appear only when making facial expressions compared to those that are visible even when I am at rest. I want to avoid the treatment looking too obvious or making my expressions look unnatural, so I am also wondering which areas I should consult about first. If you have experience with Botox, please share what motivated you to start and which areas felt natural to you. I would like to use this as a reference before my consultation!