All right, now we're cooking with gas here.
The first thing any writer needs to do is to learn and apply rigorously the various rules of spelling and grammar in the language of their choice. Admittedly, English is trickier than most in this regard, but let's work with what we have. Automatic spell checking is available in most modern word processing software, as with some web browsers like Mozilla Firefox.
Beyond that and regarding your question about detail, it's very difficult to find the right balance between enough detail and purple prose. In general, the things that should be detailed are those that are most likely to impact the storyline or the well-being of the characters. Beyond that, it's a matter of the preferences of the writer and the target audience. I have always followed a philosophy of "write to be understood" myself. Particularly when writing to attract others to your RP, players like to know what they're in for, and a detailed setting tells the players that you've put thought and effort into this role-play, which will make your vision more attractive for them to play in.
It's generally good to include some details about the setting depending on what is considered "common knowledge" that the characters would have before starting out on this grand adventure. Beyond that, it's generally prudent to reveal more about the setting only as the plot's progression requires.
As for the story line, not only does there have to be conflict in order for there to be an actual plot, but there are five stages in order: Introduction, rising action, climax, falling action, conclusion. Many people seem to forget this when designing a game, as their want to RP in their favorite story or genre overwhelms their literary senses, yet this is the central tenet of having a plot.
Now get out there and finish what you started. :)
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