To start with, you need a date and venue. The best way to decide on a date is to work by a process of elimination - decide who you absolutely must have at your wedding (parents, family, friends), get their no-can-do dates and take it from there. If you have a favorite season or venue in mind, you can also use those factors to determine your date. Once you have the date and venue in place, send out invitations, and take it from there.