Needed help urgently for developing a simple email application(Intranet based) using asp.et and vb.net/c#

Iam a fresher working in a small company

Iam working on .net
 
I have been given a task for developing a simple email application using vb/c# and asp.net

How actually we start(from the priliminary step to the end of the applicatin development)
What im confused is what are the steps needed to develop it
What are the requirements.
What i need to configure my settings in my environment to develop it.

please guide me to do so.

I would be very much thankful if you could help me out