What I do: I sit down, boot up Word, put my headphones on with good music, and I start typing. Sometimes it's crap and sometimes it can give me the shivers. Some people plan everything with writing. I don't. I do try to outline sometimes, especially with some of the 'bigger' novels that I know a bunch of people are wanting to read, but it's very rare for me to keep with the outline throughout the whole book. I usually veer off somewhere and sometimes I come back to the ending and sometimes I don't.
Writing is your own process. Write what you want to read, but just write it. I don't think anyone can tell you how to write. You just have to do it for yourself. And be prepared that when you write, it's just you. You can try to share it with friends and loved ones, but in the end, it's just you and your vision. They may not understand what you're trying to put into words except you. If you're lucky, your loved ones will be supportive, but this isn't always the case. People may not react how you want them to. They may not support you. They may try to compete with you. They may even try to tear you down. This happens too. So, if you're a writer, just write. Write for yourself and write whatever is your own vision.