My first bit of advice is to hire a good coordinator to assist you as you have only 4-5 months to plan.
The good part of planning in a short period of time is you need to make decisions NOW!
I think a wedding in December would be wonderful. Several reasons being…places are already decorated for the holidays so you don’t have a lot of decorating expense. The colors you’ll want to use will be the rich, jewel tones, such as deep purple, blues, reds, and greens, any of the warm tones.
If you decide to go ahead with a wedding for this year, you’ll need to get your dress ordered ASAP. It may limit you just a bit as to which designers you can use since some of the dresses may take 6+ months to get back. Once you’ve decided on your dress then you select your attendants’ dresses. You can go with velvets and other rich fabrics if you’d like.
Flowers can be anything from roses to orchids. Select a good florist and then take a picture of your dress with you. They will help you select the flowers and style of bouquet that will work best for you. They will also help you with your reception decor. Poinsettias are beautiful for a December wedding and you can give them to special guests. They work well for altar decor as well as small ones on the reception tables.