Hi, Cosmic. Welcome to the forums. The best advice I can give you is to write. Get your story down. Don't worry about whether it's good or bad. I don't know of anyone who gets it right the first time. That's why someone invented the word rewrite. The next best advice is to read as much as you can in the genre you hope to write in (sci-fi, horror, fantasy, etc.), not just for the storyline, but for how the writer does what he does. I've learned most of what I know about grammar by paying attention to how others do it, especially in dialog. You might consider joining a writing group, either in your local area or online. Every writer has been where you are and knows what you're going through. Hope this helps.