Hi there,
1: 5 hours work will be 100 USD @ 20 per hour.
2: I always prefer talking on skype before the job is awarded and then I am available most part of day EST.
3: I have experience of working with US based clients, I can give reference. That lasted for 2 years and all communication happened EST.
4: Take a look at my profile on freelancer, I can shed more light on my experience when we talk. Briefly, 12 years of experience in .NET, ASP, ASP.NET, C#, SQL Server (2000,2005, 2008 & 2012), Procedures, Views, Data Security, SOAP vs Rest web services etc.
Thanks and let me know, we can have a quick chat whenever it suits.
-Infomatsinc