Tutorials+Resources on How to Customize Contacts Page?

[mozilla2004]

I'm new to using SugarCRM. I want to have a users page that does the following:

1) allow a user to create sub-users, and each sub-user can then create additional sub users
2) display users in an expandable and collapse-able hierarchical tree structure.
3) add more attributes to each user
4) any newly created user should be able to login to sugarcrm using sugar's existing authentication.

Can anyone recommend me tutorials or resources that can help me achieve the above? Let me know if you need more details.

Thanks