Once you have written your masterpiece you are going to need to build a fan base. One way of doing that is by building a website. You can build one free of charge and promote your work from there. You can also tell people about who you are and how you got your start in writing. I have personally found one site that is really good to use to build a site and that is Wix.com. There website builder is easy and fun to use.
Another way to promote your book is by making a trailer for the book. You know how there are movie trailers? Well there are trailers author's create for their books. If you have a program on your computer like Window's Movie Maker you can make your own video and post on your web page or post it on Youtube.com This will help bring more attention to your work.
Last but not least, talk! Good old fashioned word of mouth promotion. Tell friends, family, co-workers about your book. If you tell them they will spread the word around and your book will get even more attention.