How should I embellish my room? My oldest sister is leaving for college within fall, and we share...

My oldest sister is leaving for college within fall, and we share a room but when she's gone, we're turning it into MY room- yay! First time EVER have a room to myself! (not that I won't miss her, lol) anyways, how should I decorate my room? approaching colors, any unique planning for a teenage girl's bedroom, etc. gratitude!
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Without seeing the room difficult to answer. The best thing to do is find something that you can use as inspiration. (ie. a wallhanding that you in recent times love the colors) once you find your inspiration build off of it. Colors, style etc...