Yahoo's aging filter? Options

[Angel8552]

Hello!
Sorry, if this has already been asked/answered.
I have registered a domain and created a new website one month ago. It's typically on a WP blog. The search engines have found it and ripped some sites. I have been listed in some of them - Yahoo and MSN, however it looks like the pages doesn't rank for any keyword they are targeted to. This week I have noticed that on some Yahoo datacenters, for ex. mx.search.yahoo.com my website ranks for those keywords, but on Yahoo! I get no rank.
I have also another similar website created one month ago, however it doesn't rank at all - even on mx.search.yahoo.com.
So the question would be - do Yahoo have somekind of aging filters built in? If so, maybe you know how much time does it take to start ranking in Y! ?
Does it mean that if my website ranks on mx datacenter, it will probably rank on Yahoo! ?
I have also noticed that Yahoo is very slow indexing websites. Is it necessary to use any blog & ping application to get the bots to spider deeper pages, even though the website is based on Wordpress blog?
Thank you