Orgasm?!

Hi guys! So I feel ridiculous even saying it, but I'm pretty sure I've never had that moment! Everyone says if you don't know, you didn't get there. Well I will be sleeping with someone new soon and I am so lost with what to expect. I've told him I don't think that's happened, and he said he will make sure it does 😳😅 I'm just so nervous because I have no idea what to expect, or how to let myself get to that point? Any help or advice is greatly appreciated!!