Laura Williams McCaffrey
Read, read, read. Read the kinds of things you like to write. Read other things, too — anything that startles you and moves you.
Also, write. As often as you can. Write regularly, whatever that means for you. It could mean every day, or every summer, or every weekend. There's no correct schedule, but find out what regularly means to you. You won't be a writer if you don't write.
Also, make your peace with terrible drafts and the need to revise. The existence of these in your life don't make you a failure. They're a normal part of the process for most writers.