For the first time:

• It's necessary to setup sql alises for the first time. You can use SQL Server Configuration Manager from SQL Server Management studio (SSMS) - native client configuration - both 64bit andd 32bit. But SSMS is huge beast. You can use small windows utility - cliconfg.exe. \Windows\System32\cliconfg.exe for 32bit aliases, \Windows\SysWOW64\cliconfg.exe for 64bit aliases. It's necessary setup both. Alieses are on wiki - SQL_2, SQL_NEW_2012.
• Setup local sql server express, it's enough version 2012. It's necessary, because modeling deployment script uses local server for generating models.

Each customer has own environment - e.g. sql server connections - and configuration. Before work, it's necessary to setup environment configuration for these particular customer.

• Go to directory for particular customer and run script for environment e.g. project Configuration/Agrofert/Activate_AGROFERT_TEST.cmd, it setups the connections strings, web configs, app config and other things.
• Don't commit these changes in Configuration dir!

There is database first approach.

• First prepare data changes - update scripts for sql structures, stored procedures, views …
• Generate changes into models
• Table names are according particular module, and customers e.g. DDDiaryReportItem - item for DailyReport