You won't find help for that here. There are even people who studied this for years and never wrote something successful or at least interesting. Only 2 options: You are a nature Talent and just have a gift or you bad story after bad story until you're 50 years old and then get successful and write your first good Storys like the big authors.
Try to get those ideas on paper. Do a story outline with all the thing you want to put into the plot. Don't be afraid of omitting some things if they just aren't working. And try to keep things simple, you don't want to load the story down with unnecessary stuff.
well the most lauded method is a bubble/flow chart type thing. you can't go wrong. also, I tend to split things into index cards and just stick them up on an idea wall. being able to visually and physically alter/move things around helps with planning the structure and flow of my papers.