I like to start out with a simple color pallet and begin there. Same as like painting your home and adding decor, colors need to coordinate but not be to matchy. Pintrest has a ton of great color pallets to get a base, don't feel like you have to go out and buy a whole new wardrobe, take what you have, colors you like and lay them on a bed and mix and match , if it's easy on the eye, it will look great in photos. Start with mom, pick what you want to wear and coordinate the rest of the family around it. Give them a choice but mom pick your outfit out first, I promise it will be a smoother process!