One method for starting a story is to tell yourself the story while relaxing or before going to sleep. Another way is to keep a notebook with your characters and plot ideas. Write as well as you possibly can so you have enough of the idea to remember it later when you are starting to write.
Outlining your story is a good tool to use so you can see how the details will let you move smoothly through the storyline as you are writing. You have to follow the story where it leads. The last thing that you want to do is to spoil your book with plot twists that do not lead to supporting your storyline. Be more interested in your characters in the situations you are putting them in.
See what ideas you can come up with to help you have more fun writing. Keep a list of those items close so you can refer to them when you begin to write. It will help you get past the blank page frustration and begin easily.
There are no rights or wrongs so be encouraged that you can express yourself and enjoy the process. If others enjoy your writing that is a big plus for you.