How to customise the meta-data in Alfresco 3.0?

[rupanjal]

Hi all,
I am using Alfresco 3.0.I want to attach some meta-data while uploading a file in a particular space.Whenever a user wants to upload a file using the web-client (Add Content),he should be asked to give some extra details (meta-data) of the file which are not there by default.What are the necessary changes i need to make and in which files do i need to make these changes?
I am new to Alfresco and i need to implement this.
Thanks in advance……..WAITING FOR A REPLY……..

[invictus9]

Create a rule for the space. Likely you will want the rule as INCOMING, All files.

The rule should add an aspect, or apply a content-type. The latter process is called specializing.

Once the user has uploaded the file, confirmed the name, added any description field, the Next button will take them to a screen that allows them to set metadata for the file, based on the aspect or content-type.