I'm looking to start a new site but I want to develop it with ASP.net.

If you are nowise developer then you have to learn or clear all your doubts. www.w3schools.com/aspnet/ please check site links. I hope it will be helpful

http://www.w3schools.com/aspnet/default.asp

THIS LINK WILL HELP YOU ..........
I AM SURE BECAUSE I AM LEARNING ASP.NET THROUGH W3SCHOOLS ......... AND THIS IS THE BEST SITE FOR LEARN WEB DEVELOPMENT AND DESIGNING ........
BEST OF LUCK......... 

You should search on the internet about the ASP.Net tutorials.You can get lots of tutorials in internet.W3School is one of them, It has all basic information about the programming in ASP.Net and other programming languages.

Before you get start with a .Net website, i would suggest you to learn all basic things about .net platform.