Congrats, and welcome to the forum. As I am sure you have found, there is a LOT of info on here. Coming from a bride with a small guest list as well, my advise would be don't get overwhelmed... Only do what you feel comfortable with (i.e. my fiance and I can't afford to do things like the dj, etc.) and with such a small amount you can do things to make everything really personal!
As to the flowers question, it pretty much sounds like you can bring pictures of what you like and they can try to match it for you, but they are pricey.
Good luck on all your planning, this site will be a great help!