If you're planning to get into writing to make money ... don't. The money is small and slow. There are faster and easier ways.
If you love writing and discover (to your shock and amazement) that they pay you (enough to live on, hurrah!), then you never have to work a day in your life.
(Though you will constantly wonder if your editors, your publishers, the critics, and your readers will suddenly see through you and realize that you're just faking it.)
My first advice to anyone who wants to become a full-time writer would be to pay all their credit cards down to zero, then cut them up.
Here's what it's like: Imagine you had a job where you're told that the annual salary would be somewhere between zero and a million dollars. And that salary would be divided into not-necessarily-equal parts, and each part put into an envelope to be delivered at the rate of one a day. Each envelope would contain either all, some, or none of your salary, and you wouldn't know what each day would bring until the mail came.
Plus there's no vacation time, no sick days, no insurance, and you have to pay double the social security that anyone else pays. Oh, and you have to work nights, weekends, and holidays. And your boss will know if you're slacking.
Who the heck would want a job like that?
There's a TV show called Castle, starring Nathan Fillion. Mr. Fillion portrays a writer.
Do not believe for a moment that that's what a writer's life is like. Not. Not, not, not, not, not.
I saw a wonderful cartoon strip once, showing the life of a writer. In the first several panels the writer is sitting in front of his computer going tap*tap*tap*tap. The only changes from panel to panel are the hands on the wall clock, the location of the cat, and the level in the coffee pot. In the last panel it's later that night and the writer is in a bar. A beautiful young lady is saying, "You're a writer?! That must be so exciting!"
This too is unrealistic: There aren't any beautiful buxom young ladies, either.