One way is to go to this website
www.RentACoder.com
On a more serious note, you don’t just say I want to build this application using certain technology (ASP.Net in your case).
Do you know the functional requirements?
Once you have detailed requirements, evaluate which technology is best for implementation based on the resources (hardware, hosting, people, knowledge, skillset etc.) you have.
Then come up with high-level technical architecture/design of the application. You might think of it as whether it needs to be a MVC App, three tier application etc.
Now, drill down to your technical design and start implementation of different layer. Personally, I would suggest to start with data definition so that you have clear idea of what your service and UI needs to support.
I hope this helps!
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