My First Time

Me and my fiancé go way back! Since kids he'd always hit on me and then I moved to the US and when I'd go visit my hometown he would always hit on me but I'd always ignore him. Until last year. We started dating and now we're getting married in January of next year... But one thing I'm terrified about is my first night with him. Like what will I do? What will happen after we're alone to do it? Any advice? I'm completely lost on how to do anything. I swear I'm like a 5 year old when it comes to sex 😂. Now kissing is a different story, but sex. Not something I'm looking forward to right now.