Step 1: Personal tastes (colors, themes, favorite flower varieties, idealized materials and decorations, etc.).
Step 2: Key features of the location where the wedding ceremony will take place, as well as the location of the wedding reception (if it is a more rustic place, with a mountain or sea view, it is a historic space, or more contemporary, among others that you think are important. Step 3: Research and annotation of decorations to serve as a reference for what you want (even if they are not what you want, they will serve to visually express what you want) Now yes ... look for a decorator who inspires confidence and demonstrates that you are up to the task of helping to realize your Dream!
Remember that a good organization and having people you trust by your side is a key step for everything to run smoothly.