Custom user fields / Categories

Hi,

I’ve already made a 2 site using wordpress, but are plain simple ones, and so there was no problems, but now I’ve one to do that is cracking my head.

Here’s my problem:

The site will have a admin/editor that will post all the content, but that content will be written by a few collaborators and friends of the admin.

When he posts an article he want to be able to choose the author from a list.

In the “contact us” page he want’s to display a list of those persons (but not all).

Basically I want to be able to have a secondary “roles” list, when I creating (modifying) a user, with two checkboxes for “author” and “contact”. If the user is just a author it will show up in the authors list when writing (and displaying) a Post. If he is a contact too, is data, (name, e.mail, phone….) it will show up in “Contact us page”. If he’s just a contact, it wi’ll not be available to choose from in the “posts” page, but it will show up in the “contact us” page.

I already managed to crate the user custom fields (adress, phone…) but cant figure out the checkbox part and make the “authors” list to show up in the “new post backend”.

Anyone can help me on this? I’m reaching the deadline and I’m getting all stressed up ’cause there a lot of things left to do…

Thanks in advance.