You can't get in Yahoo fast, you'll appear onthe SERPS after 2 - 3 weeks of your website launching, then you'll disappear, and if everything goes right you will re-appear after 4 - 6 months for good.
It happened that way for one of my site,
Also you might appear in the SERPS in the period after 3 weeks and stay in the ranking for the keywords you target. If you don't appear at all, use other keywords. 3 keyphrases keywords usually works well for new sites.
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