If you're a writer who has the same problem as I do - too many ideas, too little time - here's a bit of advice on what to do when ideas come too fast. It doesn't help with finding the time to write everything, but it's a great suggestion for making sure you don't lose the ideas. I do something similar myself.
On the other hand, if you're struggling to fill that blank screen - or piece of paper, if you're writing by hand - here are some tips on how to beat the blank page and write.
Either way, later - when you have something written - these indie publishing tips may be useful. They're especially good to bear in mind if you're a self-published author . However, they're also worth considering if you're traditionally published, since even traditionally published authors need to help out when it comes to marketing their own books, after all, publishing companies will only do so much. So, check them out regardless of how you publish, since they're great tips to consider when figuring out your marketing plan.
Are you worried your story may be either too long or too short? Take a look at this post on how long your story should be. It's officially aimed at the writing of short stories, but most of the tips are useful for writing novels too.
Regardless of your story's length, if you need to work on your descriptions, check out these tips on things to consider when writing descriptions.