Application and Database server Specs ?

Question

I Developed Web App (Asp.net) will run at 42 nodes via internet

 

# users will access this App over 70 at the same time

 

App have Multiple Web Forms and over 20 Report each of them have at least 3000 records

 

Database (MS SQ L Server 2008) have tables have over 4 Million rows Data and Meta Data about Our Company Customers