Wedding? Help.

So I’ve never really been to a wedding and I have no idea what needs to happen other then venue, flowers, cake, catering and photographer. I feel like I’m missing something. I also don’t know how to really plan a wedding but can’t afford a wedding planner. They are super expensive in my area for some reason. My fiancé’s family doesn’t get along with my family and everything just seems to be going downhill but I’ve always wanted a wedding. So I’m determine to get it. I just need help on how to plan and everything so any advice would be great! Thanks!