Allowing user to edit only the page content and some custom fields in wordpress

This is the site:

http://www.backpackers.rs

Using "User Role Editor"开发者_Python百科 i have user group that can only read and edit published pages so i can have as many users as i want in that user group and they all will have only one published page on their own so they can edit only that page.

Now, this is how a user in that user group currently is seeing "edit page" page:

http://i39.tinypic.com/rwuesh.png

What i need is to disable all those things that have a red border around it + something with custom fields. So i need to disable these things for user in that user group:

1. ability to change status of the page
2. entire "Attributes" block is something that he/she must not see or be able to change
3. ability to change something in "Discussion" block
4. he/she shouldnt see "Page revisions" block
5. i need a way to give those users ability to use only some custom fields. Currently we have 6 custom fields, and i want to give these users ability to only use 4 of those custom fields.
6. i need to disable these users from creating new custom fields.

I dont need complete answers for these things, something to get me started is really what i need. I have been reading codex a lot, but still didnt find something to help me with this, so basically any answer is more then appreciated!

I've posted this link before, but check out the Adminimize plugin. It allows you to disable practically anything in WordPress for users. It does so based on the user's role.