WhimXel

I am a basic member and want to sell my lindens. My US balance is 0 and I am not sure how I can raise it. I know this question must have asked a few million times but for the life of me I can NOT find anything. I've become very confused and frustrated trying to figure this out, seems as if it's a breeze to buy but next to impossible to sell. Please help, I feel as if I am going crazy.