Depends if you are big on "matching" everything or not. I'm not a fan myself - you could make it simple re: bridesmaids by getting them to choose their own dresses and giving them identical flowers.
Colour palattes can be quite flexible - it depends what you like. I liked to google wedding photographers and have a nosey at the real-life wedding photos they used on their sites to see if I could steal any ideas - cheaper than wedding mags! Also wedding florists could show some combinations you like!
Congrats by the way, very exciting news!