Ok, there is some plugins for custom fields (I would like to use Custom Field GUI plugin). But I need some more functions.
1. I need to make that a custom field is a one small icon.
2. The second thing which I need is filtering posts by the custom field. For example - custom field is an author (not the author of the post, but the author of design etc.). So when I click on this author it will show me all posts which have in this custom field the name of this author. This same function I need with the icons ^^
3. Custom field is link
Any tips how to make it ?