This guide isn't really on writing, but more on posting work on the Internet, on sites like Fictionpress, Young Writers Society, or any other site.

Before you post work (if it's a forum), you should introduce yourself and post in some other topics to spread your name around the forum. Also, be sure to review the works of others beforehand. That will get you noticed and get others to review your works. Some places have a mandatory review to work ratio, meaning that you have to have a certain number of reviews for every work you post. Even if it doesn't, you should still review other works. People who only post and don't review don't get many reviews of their own.

There are also a few unspoken rules and guidelines that you should follow when posting work.

1. Make sure to check your work for grammatical errors and misspelled words. It makes it much easier for the reviewer, since they will have the ability to focus more on core issues, like plot, characterization, dialogue, and prose. Also, this is the age of spell check. Grammatical errors and misspelled words just make you seem lazy.

2. Properly space your work. Put a gap in between paragraphs, since indenting usually doesn't work online.

3. Don't post too much or too little at a time. Readers will be intimidated and turned off by a 10,000-word wall of text, and seven lines of story gives them almost nothing to review.

4. Have a title. Just saying "untitled" or "excerpt" won't get you many clicks. Also, be sure to properly capitalize your title.

5. Don't post in your topic whining if you don't get any reviews. If you do, it will probably stay that way.

Now, not all of your reviews are going to be "OMG! This was awesome! Post more!". In fact, on most serious writing forums, none will be. Don't worry, no one should be telling you that you suck, but most will be giving constructive criticism, telling you what they liked (and why they liked it), what they didn't like (and why), and how to improve. They may also include a few "nitpicks", which are quotes from your story along with a comment, usually relating to grammar, spelling, word usage, research errors, or contradictions. Here's an example

I liked it, but it needs some work. The prose is good and I love the more original aspects of your fantasy world, like the giant beaver mounts, but this character Deinor is seriously looking like an enormous Gary Stu right now, and there is glaring evidence that you need to do more research.

For example, swords do not weigh 25 pounds, they are actually quite light. Also what is Shiena doing pulling that longbow if she's supposedly stick-thin and petite? You needed muscle to do that. Research weapons, castles, and armor some more.

And as for Deinor's Gary Stu-ness, it may be too early to judge, but you could really turn off readers this way. You say that he can control 3 elements while everyone else can only control 2 at most. Why? What's the explanation?

One small nitpick:

"Deinor, and Shiena moved silently through the dingy hallway."

That comma should be deleted, and if this hallway is the main hall of the castle, then it's probably cleaned often enough to not be "dingy".

This is one the reasons that I would recommend a forum instead of Fictionpress. Not only is Fictionpress unnecessarily complicated, but the members are more likely to either praise you without telling you what they liked about it or flame you.

Once your story is up, you can put a link in your signature, so that all your previous posts will have a link to it.

And as for the people who do review your work, be nice to them! Don't whine or complain when they give you constructive criticism. They're trying to help you improve by pointing out what you're doing wrong. No writer is perfect. You will never improve if you think your work is perfect. People have to point out what is wrong with your work so that you can fix it. However, you should take everything with a grain of salt. If one reviewer says that your prose was awkward, but all the others liked it or didn't comment, then perhaps that reviewer was wrong. Still, if a majority or near-majority of your reviewers point something out, then you should definitely work on fixing it.