and concur with Alex Bragi ...

That being said, there are many ways of improving writing skills. Go to a local bookstore and search for books about "how to write". Ursula K. LeGuin has an excellent book about crafting a story, and she is just one of many.

Buy a REAL thesaurus, and a very good dictionary. Not a little pocket one, spend the big bucks and get a REAL dictionary. It will last you a lifetime.

Read. Read, read, read.
Then read some more.
And when you read, pay close attention to the author's style, point of view, and wordmanship.

Take the time to develop your character, get into his/her head and think they way your character does.

Take a creative writing course ... local university or college, public library or bookstore can help you find one.

Then, when all else has been put in place, sit down at your keyboard and get to work. Knowing that most of what you write is going to need re-writing.