Pick the right category and sub category, if you're confused visit the sites in the category to see if you are in the right place
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Enter title or description which represents your site about, use profesional languange or at least not some vulgar one in the title or description.
Do not use excessive caps word (e.g LIKE THIS IN THE TITLE OR DESCRIPTION)
Submit your site just once in the mean time. It may take some times before you receive message about your appliance. If After 1 month you don't get any message regarding your site, you could re-submit it.
Make sure your URL are active.
Avoid ilegall content such as pornography, drugs, pharmacy, gambling, etc. Febrian Wen @ www.doreki.info