Generate EDI file (X12 04010 834) from data stored in Sql tables

The first steps you should take are going through all of the BizTalk Tutorials: http://msdn.microsoft.com/library/aa560270%28BTS.70%29.aspx

There are also a number of EDI Videos for BizTalk Server: http://msdn.microsoft.com/en-us/biztalk/gg153507

They cover general BizTalk Design, EDI and AS2.  The EDI Tutorial will cover how Trading Partners are managed which defines how the EDI Envelope (ISA/GS) are defined.

After you're comfortable with that, you general solution will likely look something like:

1. Extract the data from SQL Server as Xml
2. Mapping to the 834 Schema
3. Batching
4. Send to destination Party.