@munchkin1234real
Sure thing!
When you start a story its best to know the genre and then find the start, middle and the end. There really is no point in starting a story and not knowing how it's going to finish. So, once you have an idea of a story, you have a plot and you see an end, make notes.
I've been telling people lately to use a spider diagram. It helps a lot to form a coherent idea and turn it into something big.
So say for e.g. you start off in the middle with a genre, "Fantasy"- break off with "witches" "wizards" "vampire" or whatever takes your fancy. Next "Setting" this could be either House, School, Abandoned building, Cemetery- and break off with its description, cold, wet, spooky, damp etc.
Then come in with your characters. Male/female, hair, eyes height,- branch out and describe: irritable when cold or hungry, likes to fight, thinks girls are idiots but secretly fancies the majority of them and so forth.
Once you have this you have the first stages of your book done. The next bit it detailing your plot.
Start at the beginning, do these people meet, does something happen at the beginning that correlates to the end? Do they live different lives but know each other in secret? Ask these questions and find out about your characters- you need to know them. They are going to inspire you to continue. I always find that I want to know what my characters would do if they were put in a difficult situation. It can be funny, boring or harrowing.
You need to ensure that there is a theme that continues through your entire story and you need to ensure it is talked about to keep the readers interested. My theme is urgency mixed in with some secrecy. This is where the twists and turns come in. Do things differently than you have read. Try and think of weird things that no one has thought of before. Be creative and ensure that you are making your target audience gripping their seat wanting more.
Tie everything in with the end and you have yourself a book!