Get rid of things you don’t need or use. Reduce, reduce, and reduce some more. If you have to keep it because of sentimental value store it in the garage or attic.
Make a collage of pictures that speak to you. You can do this with magazines or online on Pintrest or Houzz.com. Make a list of the elements that you would like in the room like the type of fabrics, materials and paint colors that speak to you. You are not copying anyone. You will use this to find out how you want your end result to look like. It helps with vision.