@coal_chesslavitz just write what your thinking and it will all flow and if you dont feel confortable wait till later in the story to add mature scenes! Dont worry about your views at first you will gradually get more the more you write.... You can also pick a topic you love and write about it or something that happened to you and make it fictional and add different charecters.
If you need anymore help just read little parts of my book so you can get ideas.... Bye bye