A book of my own

Any suggestions for a person who is about to write their own book? Theme will be sci-fi, because I feel that every other theme has been covered by another writer already.

Won't be anything like things that already exist like Star Wars. I'm planning on writing something completely new, something that people will find interesting to read.

I've never written a book before though. Are there things that I should look out for? Applications that help out in writing a book, or should I just bring out the good old Microsoft Word?

You know how fucking hard writing a book is? Are you seriously planning on doing this? No chickening out due to writer's block? No drama and no bullshit? Do you REALLY want to motherfucking write a book? How old are you?