earn money as a writer

Umm, I think you'll find that the time you save by typing quickly is minimal when you compare it to the time taken to research, compose and edit. The actual typing is the tiniest part of the whole. That said, it's nice to be able to type quickly if your ideas are flowing - you're less likely to fall behind!

Yes. That is fit for the professional writer I guess. I think those professional writer have already earned a good money just by writing. I do not know all about amateur or for those writers that are beginner but, what I see is most professional writer get a good money rather than writer who takes it as a hobby. I am not sure but, that is the way I see it.

Of course you can, but do you know that you don't have to be a creative writer. Because websites those have lots of pages always look for good quality writers to fill out their pages. I personally experiences some sites those didn't required creative writers, Those are specially Portfolio sites.

I type at a reasonable speed, however I am not confident with my writing skills in english. I'll try to improve on it since I really enjoy writing.

You are right. If we are good in writing and have the ability to type fast we can write a lot of articles based on our creativity and make good money from it. Article writing is the best way to earn more from online.