search module with specific fields

Hi,

Thanks to cck, I created a new content type with specific fields.
Now I wish I could have a search module searching these specific fields.
It looks quite difficult (implement hook_search?)
Someone knows or developped a similar module and could help find a basic example?
Anyway, it would be awesome if there were a generic search module (I mean in which you can specify the fields and parameter the query)!!!

Thank you very much,
Michael