Writing

I've always liked writing about something that I don't know about and then get to learn about while writing. One time writing about hockey, another about traveling to different places that I've never been to. This time, I'm writing way out of my norm. I'm writing about a couple from the engagement until the day before the wedding. I have no idea what the end is going to be, because I'm writing this with someone else. My friend, Mike, came up to me last semester some time and asked if I could write about a comedy, drama, romance screenplay. Well, I've never written a screenplay, so I'm writing it like I would write a book, so there is no worries there. But he won't tell me the ending. I don't know if these characters live or die or if a zombie apocalypse is going to break out and eat their brains right after they say I do. That's a little frustrating, but not much. 

My real issue is that I have never been engaged so I don't know what it's like and don't know what is realistic. I've been asking my friends that have been recently engaged or married to tell me stories that stick out in their minds. A great friend of mine, (wished to be know as) Anonymous Jaded Newlywed, has helped out a lot already. I have the correct order of events written down but how do I go about telling the parents that they're engaged? I want this to be realistic and plausible, but at the same time, stands out from the normal "everybody did it this way." Congratulations Mike, I think you've finally stumped me, but I won't give up, I'll just keep working at it slowly and hopefully something good comes out of it.