Aside form what's been said already:
Space out your initial uploads so that they're 2-4 hours apart. That'll help draw people in from different time zones. After you have all the readers you think you can get just from the initial surge of interest, you'll want to set a consistent time though.
Also, the site doesn't always have a lot of traffic, so uploading when nobody is around to see your story is a waste of time. Only the readers you already have will see that you posted at all.
Outside of that, the most important thing you can do is tag your work properly. It can be tempting to add popular tags or hide unpopular tags, but that will just frustrate your readers if it's a lie. Do make sure you have all 25 minor tags that you're limited to though. More is always better, since it increases the chance of someone finding you through a search.
Lastly,
@WelcomeToSH. There's a lot of newbie advice at that link.