There is much more to writing than simply putting pen to paper. If you are seeking to write your first novel, you've probably already figured that out. There are many tips that an aspiring writer would do well to follow, but nothing is more important to developing your skills as a writer than reading.
Creative writers can rarely get away with not reading. Reading the work of others, especially in a given genre (such as science fiction or literary fiction), exposes the writer to new possibilities. As a writer, you can learn what works and what doesn't and develop your own unique style simply through exposure to the writings of others.
Reading is also a fun and easy way to search for inspiration. This doesn't mean stealing work from another author. Plagiarism is unethical, and you'll eventually get caught. However, there is nothing wrong with discovering how other writers solve problems relating to plot and character development. These things might prove useful to you in your own writing.
There is yet another reason to read. Research. Yes, I said the 'R' word. As a creative writer, you are not exempt from reserach. Perhaps your main character is in a desert. You'll need information about deserts. I know I did when writing Arianna's Tale. Now that I'm working on Dragon's Tempest, I'm having to research sailing. Research makes for a more believable story.
Extensive reading will make you a better writer. So head to your local library or bookstore and get started.