Wordpress Plugin Coding- Filter Hooks- Need Help!!

[physaux]

Hey guys so I'm trying to write a wordpress plugin.

But nothing I do is working!!

I'm not sure even how I should approach this problem, which filter hooks to use and how.

I've been searching everywhere for help, but to no avail.

/whining

 

Anyways, here is what I want to do:

 

Create a plugin for Wordpress that does the following:

-prevents posts from category [some X] from being displayed- EXCEPT if the post ID is [some Y]

 

Any idea how to do this? I'm thinking of editing the WP query but I'm not sure how to do that...