How should I redecorate my room?

I'm a 21 year old woman, and mother, and single. I like a lot of the modern mixed with neoclassical, but idk. I have high ceilings, my bedroom is 21x15, and I don't know how big my bathroom and closet is, but I want to redo them too. I just want to add some color, decor, and new lighting to it. The house was built probably about in 2008. I also live in Frisco, TX so where can I find some glamorous, trendy, young decoration and furniture stores in the DFW area? I don't want any bright colors either. More warm colors. So what do you guys suggest??