I was a new website, some time ago a very good keyword rankings, but yesterday I checked the rankings, actually none, and I was very anxious! Is this how about ah?
Might be google dancing or If you have been doing unethical activity then It could be panda effect....Could you share us your site url???
Well how did you utilized your keywords? I mean did you having duplicate content there? If ye then it's affected by panda but if not then how long did you updated your site? You've to add more fresh content at your site maintaining the density of keywords.
You should check all things like content back link and assure your back link should not be from unethical websites.
Submit your website in Webmaster tool & then apply SEO for your new website fro getting traffic, ranking & pr from search engines
Check the quality of the content of your site. If your articles are full will errors and mistakes then it may be affected by Google panda. Check the grammatical and spelling errors of your contents.