How to have the period talk with daughter


So my daughter will be 10 in May. I started my period when I was 12 and my mom never gave me the period talk. Thank god I started at a friends house and actually felt more comfortable telling her and her mom than my own. I don’t want that for my daughter. So moms who have been through this how do I go about having this talk? I need advice I have no idea how to start the convo and of course don’t want her to freak out. 😬 help!!