I'm having one of those days where I feel like a complete fraud and have absolutely no business talking about writing, much less giving anything that could be construed as advice. So instead of a normal post I have some useful links, from people who actually know what they're talking about.
Allen Guthrie's Infamous Writing Tips - from the Absolute Write forums. Not only do I have this bookmarked, I printed out the initial post to keep in my Home School For Writers binder. The 32 tips are pretty straight-forward, mostly things that can easily revised once you get into the second draft of your first novel. After that you should be able to follow these tips in the first draft of everything else you write.
The SFWA's author information center has several articles on multiple topics.
The Inigo Montoya Guide to 27 Commonly Misused Words - your editor will thank you.
Nathan Bransford's How To Write A Novel post. Not only is he an agent, he's written a novel. In fact, if you're a writer and you're not following his blog, you need to do so. Seriously. Follow him.
Another blog every writer should follow is Writer Beware. It keeps followers updated of scams designed to separate a hopeful and perhaps desperate writer from their money. It would be great if every writer was savvy enough not to fall for scams, but sadly it seems that not everyone is aware of this rule:
Yog's Law: money flows toward the writer. A writer should never pay to be published. As far as I'm concerned, it's just that simple.
So take a look at these links - these people know what they're talking about.