Reading a lot of books will help you pick up a few things about good and bad writing as well as introduce you to different genres and styles. Try out a wide variety of authors and types of works to figure out what you like, what you don't like, what works, and what doesn't. Then try to use that in your writing. You can also see if your favorite authors have a writing blog where they share their writing process and post tips and advice to aspiring writers.
But no matter how much you read about writing, you'll still need to practice. Set up a routine and experiment to see what conditions you tend to like writing in most. There will be days where you don't feel like writing at all, but try to push out at least a paragraph or a few sentences anyway.
Here are some links that you may find useful:
Grammarbook.com
25 ways to Plot, Plan, and Prep Your Story
Writers Digest