Pls help any1.. to sell on ebay. I'm confused how to....?

I keep trying to sell on ebay but I always get muddled up with the posting fee and then I give up. AM I supposed to contact the post office or something or arrange a pickup shipping method myself? I never did this so I'm really confused how to sell stuff on there. How does the whole thing work? Plsss helpppp.. tell me how to step by step.. pls???