I am having some problems in creating forms ?

I am working on a mysql database. It will be online so I am creating the insert, edit, delete e.t.c pages. While creating those pages I am facing some problems. By the way I am using Adobe Dreamweaver CS6 to create the pages. The problems are as follows:

1) I have two dynamic select menus in one form. One has the names of Divisions and the other has the names of Districts. So when someone selects one division, I want only the districts under that division to show up in the other select menu. How to do this ?

2) How to create a file upload form in Dreamweaver ? Please tell or link me a tutorial describing how to do it.

3) I have a login security in my dreamweaver pages. There are multiple users on my database. When a person logs in, I want his or her name to be displayed on the home page. How to do this ?

Any help is greatly appreciated.
Thanks in advance.