I have a content type and what I want to do is show a block on the right hand side only if the user is viewing that content type using a custom module. Any general pointers as to where I should start looking?
This can be done in a few ways.
If your content type always has a unique URL (such as /news) you can set the block to only show when on a page matching that URL.
Or this can be managed in a variety of ways using different plugins that allow for the manipulation of displaying content types and their corresponding views/blocks.
Are you currently using any plugins like that or have any themes installed?