Writing and Posting Question

New to this forum. I am writing a story but looking for advice, reviews, etc. Is this the correct place for it? I am not a great writer and have never done this before. I figured I would take some of my fantasies and write them down. My first story is so far very detailed (which is kind of what I want), but was hoping for some advice. Any suggestions? Not looking for a bunch of trolls telling me how much I suck. I guess more like a mentor or something. Thanks