Matching existing furniture to a new appartment

I'm in need of help matching dining room furniture to my new apartment. I already have the furniture, but I need help finding the right colors and styles to ensure everything will fit together cohesively. I'm not looking to buy any new pieces, but rather take the existing furniture I have and match it with the existing styles and colors I want to incorporate. My goal is to create an aesthetic that will make all the elements of the room look unified and flow together.