La Leche league is  a wonderful site for gaining knowledge on how to induce lactation ( even if your not pregnant),  those of us who were not born cis female, can also use these guidelines to help induce/start lactation. even relactation, if you have previously and not kept up with it


https://www.laleche.org.uk/relactation-induced-lactation/


feel free to browse around their site and their forums to get a more in depth understanding.