If you haven't seen them, I would check out Mr. Sanderson's lectures at BYU. He talks about various aspects of creating fantasy and scifi stories. I found them to be very helpful.
I watched them years ago and they were helpful but I found them to only touch the surface of topics like plot and character creating, world building and so on. But what really helped my writing was K.M Weiland's series of blogs on writing. A friend of mine also a blog you'll find helpful. Emma Darwin Itch of Writing.