Here is some basic info from another thread:
Intimate weddings are limited to 8 people total (but can be increased to a maximum of 12 people for an additional charge). They are a package type of arrangement, meaning that while you will have a little flexibility (like choosing what flowers you like and what cake flavors you prefer), your choices are limited in exchange for a much lower cost. Intimate weddings include a ceremony followed by a cake and champagne reception. There is no reception with an Intimate. You are free to arrange dinner plans for your group after your renewal, but this would be at a regular restaurant, not a reception location. Intimate weddings include hotel accommodations and tickets, but you can purchase what is known as an Intimate add-on if you do not need accommodations and/or tickets. Since there are so many ways to get discounted rooms, this can be a less expensive option (since Intimate packages are booked at rack rates). Im not 100% sure about the pricing, but I believe that Intimate add-ons at outdoor locations are $2300+ and Intimate add-ons at the Wedding Pavilion are $3100+.
Custom weddings have no limit on the number of guests. Just as the name implies, they are completely customizable events from menu choice to flower choice, etc. The only limit would be your own budget. Custom weddings include a ceremony followed by a pre-reception, then a reception with a meal. There are minimum expenditures for Custom eventsthere is a $10,000 overall minimum (plus tax and gratuity) for weekday events, a $15,000 overall minimum for events on Friday or Sunday, and a $20,000 overall minimum for events on Saturdays. Anything you purchase from Disney and use on your wedding day counts toward this minimum (food, beverage, floral, entertainment, transportation, cosmetology, photography, videography, etc.). Additionally, there are minimum expenditures on food/beverage. These vary by time of day and by venue choice, but range between $75-$125 per head minimum (plus tax/gratuity). This food minimum does count towards your overall minimum. Custom brides/grooms get one night of free accommodations at the Disney resort of your choice, but the rest of the accommodations expense is up to you. Tickets are not included, but can be purchased at special wedding discounted rates. Additionally, you must meet a minimum number of room bookings. This number varies with your guest list size, but its generally not difficult to meet.
Hope that helps a little bit! Can you give us an idea of the size of your guest list? That will help us recommend good locations for the size of your group.