First, pick a date- any date. It's crazy, I know, especially because you have 365 days to choose from! If you are impartial to a date in general, pick a month that you like best, whether because it's seasonal, practical, etc. For me, I said i always wanted a fall wedding, so I said, "October, works for me." Then, I decided I def wanted it on a SATURDAY, so I looked the the Saturday dates that were available in that month. I think it was the 6, 13, 20, and 27th. My fiance didn't want the 13th because ONE DAY, our anniversary's going to be on a friday, I didn't want the 27th because that's my cousin's birthday, and I wanted it sooner, rather than later, so that pushed me to the 6th, rather than the 20th. The first thing I did after that was call the reception hall and tell them my date, you want to book that ASAP!! When they told me that October 6th wasn't available, I had the option of bumping it up a week (September 29th) or moving it back a week (EEK- October 13th).
My flowers/wedding colors would still be in season for September 29th, so I didn't mind pushing it up, especially because I didn't really care too much on the date- it's about the marriage- not entirely the wedding DATE!!
If you have a special day that you want to get married, Valentine's day, the day that you met, specific dates MAY be harder to accomodate, depending on how much notice you give the reception hall/church, etc.. As long as you are willing to be somewhat flexible, you know?
When you are booking the actual date, they are going to ask minimal questions- (Unless you're planning an on Disney grounds wedding, they'll need more information.) They'll ask your name, fiance's name, specific date, anything special you may have in mind of doing (i.e.: doves flying, or something?), and the time you're thinking of. Also, they may want a round-about idea of how many guests are invited (for fire capacities, food preparations, etc.)
Wow, I typed a lot. Sorry. Once you have the date, contact reception hall, then church, or wherever the wedding is being held. Are you planning to get married on WDW grounds??