Help for my project in ASP.net regarding online test on various topics

Hey friends I am working on a project In ASP.net regarding online Testing.This project enables a user to give a online test on various topics..but i am struck with designing part of pages. How should it look like..,What features i need to have , Should i have a timer display on the screen for user ,Should the questions load from the database dynamically or should i create a static page for the questions,where should the controls be placed...etc etc !!

So how should i approach the problem ???