I am new to REST. I was reading many article about REST. Still I am confused and do not know exact reason when we should go for REST rather than WCF traditional services.


Question: I want a pre-configured SharePoint 2010 Environment
Answer: As far as I know the only choice is CloudShare which has best price of $60/month. You can even try for 1 month free.
You can also setup your own VM on your computer if you have 6-8 GB RAM in your computer, and it is easy to do it.
If you need someone, you can look for freelance guys at Elance, oDesk, or Freelancer and someone will do this for you at good price.  


You need VM software. Get free one from VirtualBox. 
Windows Server 2008 or 2012, get the trail for 180 days (6 months)
from Microsoft site.  
MS SQL Server 2012 trail for 180 days (6 months).  
SharePoint Foundation is free and for SharePoint 2010 Server you can
also get 180 days (6 months) trial.