How to kiss someone?

So I'm seventeen... and haven't had my first kiss yet. Embarrassing, I know 😅 anyway, there's this boy I've been talking to, and he has given me many signals about wanting to kiss me. And I want to kiss him! But I don't know how! How do I initiate it? How do I "make out" with someone? Please give me any advice you have, from one sister to another!!