You should try out Google docs if your are collaborating with someone else while writing. Both of you can edit the same document at the same time. Now let's talk writing basics. It is best to take a top down approach. Produce an outline of your plot from start to finish.Every story has a beginning, a middle, and an end. Figure out what your story is about. Know your ending before you start. This allows you to add subtle foreshadowing right from the start. Make sure you actually do end your story srong.
It is good to also start out with some notes on what each chapter is about. Your notes don't need any sort of formal formatting. The start is most important. This is where you make your "elevator pitch". Get your reader hooked in the first 25 words or less.
