Welcome and congratulations!!
There is no rehearsal the day before. You really don't need one either. They will tell you exactly where to go and what to do. Plus, I'm sure you've been to enough weddings to get the idea of who stands where
As for rehearsal dinner, many brides set up a time and place to meet in the buffet. If you get there right when it opens you can "reserve" a section for your group. This option seems to work the best and doesn't use one of the dinner credits for your guests.
For the symbolic ceremony, you can have your friend officiate. I'm sure it'll be lovely!