How to move ahead with the flex/php application structure

Hi,
Its been a week since I strated learning Flex. I am a regular php web develeper. Since starting the flex learning I have got one thing there is no concept of "pages" in flex like in a regular php web site..there is "States".
Now I have this project requireing a login and then as per login user role different screens.
Lets say three loging roles 1) teacher 2)Student 3) Admin
Screens for each role will be diffrent as each have diffrent dashboard feature. I am confused with the structure i have decided is correct or not. Please review or suggest how to accomplish this.
The main.mxml will have login form.
it will have three states teacher, student, admin. and then these three will have sub states for particular roles features.
While going to one book I read a mxml file has atleast 1 state so can the structure be like this. (Is this possible or not)
main.mxml will have login form
three mxmxl files for teacher student admin and each will have statets for their respective features.
Please reply. I am trying to find out by reading the documentation properly. But your guidance will speed things up and help me understand things quickly.
Regards
Siddharth

ultimately you want to be aiming to use a MVC structure
but this is a good tutorial to get started.
The later videos work through a login/logged in states example
http://www.adobe.com/devnet/flex/videotraining.html

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