The only thing that is important is that you chose the right spouse. Everything else is a distant second.
I do have a couple pointers: invite more of the people you want to hang with and less of those that you feel an obligation to invite...and that includes relatives.
Don't feel overly obligated to walk around your reception making sure that you talk to everyone. Focus on making the day and night memorable with your spouse.
Elegant but simple is better than fancy.
Take several moments throughout the day to soak it all in and count your blessings.