Pick out your favorite fabric or painting and use it as inspiration. I like bold and vibrant but if you do the walls in a neutral or grey, you can play with colors in the accessories. Good luck. Visit Pottery Barn website.
I recommend checking out Sherwin Williams website. When we had our house painted I spent hours on their site looking at colors. Once you find a color you love they include coordinating colors to make thing even easier. Once I narrowed it down I went to their store and the employees were extremely helpful. I also checked Pinterest and Houzz for color inspirations.