I am trying to get my head around the Entity Framework and specifically Linq to Entities. If I have a SQL Server database with about 50 tables, many of which are related to one master table, is it proper to just create one entity framework including all the tables in the database or should I create several frameworks depending on how I am going to be using the data. If I include all the tables and then drag the master table onto a form it appears to be doing an awful amount of work. At this point I am somewhat overwhelmed and can't seem to find the place to break in. I am using VB.Net and SQLServer Express 2008.

As you can see by reading the above, I am confused.