January Wedding

The photgrapher seems very good value, I'd ask to see some examples of his work. On colours lovely warm jewel and metallic colours would be great. Think rich, ruby reds, midnight blues, forest green, fushia pinks, deep golds and bronzes. Flowers wise calla lily, roses, ivies, plus anyway you can pretty much get what you want at any time of year, just look at what the flower sellers on Grafton St. have at that time of year, it's still an excellent display.
Make sure to negotiate your food bill and room rates for guests as this is traditionally the slowest time of year for hotels. Also if a friend of their dad/mum/sibling etc has a great car use that. Make your own invites, it's fun and doesn't take long and they can look much better than shop bought one, DIYweddings are great for that, don't skimp on entertainment as it makes the night, check what the local choir is for the church, organists etc. they can be quite cheap, print your own mass booklets you can get templates for the net.
Best of luck and congratulations.