Hi! I would start with your travel agent, that has possibly planned for groups in the past. She or he can recommend some places with group deals. This site is also a great resource, as well as reviews from trip advisor. Once you have it narrowed down to a few beautiful resorts, check their website for wedding ackages, and of course more reviews. I would def recommend somewhere all inclusive, takes a lot of budgeting out of your guests hands because everything is included. Happy planning!