You might want to head over to the wedding section of the site. When i was planning my wedding, tons of people had wedding websites. I'd browse around and see something that you like and borrow edit the code to personalize it. Lots of people just borrow snippits of code from lots of places. You can do it from scratch but i don't like to re-invent the wheel.
Check over on theknot.com i think they have something you can create over there, i haven't used it.
I bet if you check on some other wedding planning sites, they may offer site space as well. If your getting married at disney i think they now offer some web space. I thought i read that somewhere, but could be wrong.
I think we used the free space over at my.yahoo.com
You can use something as simple as notepad or stuff that is more fancy.
Another thought. you could make your own yahoo group. I know some people did that for wedding information. Depends if you want more presentation or information for the guests.
Connnie