Mood board is tool to organize your ideas, to have a overview.
what do you need to buy, why, if they will be harmonious in your space.
Sometimes you buy table and you buy wrong chair it doesn’t fit in the style of your living room.
The moodboard give you an perspective for your room, what you should buy and what you should avoid.
A easy way to start your mood board is for
you select some photos of your main idea
what you can after you can start select your favorite style
depends on the room you are going to design my suggestion is always select the big furniture first, until you select the little itens.
the furniture is the most expensive and the hard decision to make, since you have this settled the others things it comes together.