Installing SQL Express via bootstrapper and create a database

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Hello,

I have a problem in understanding how a Visual Studio Setup Project installs a SQL Express database and a database Project creates a database.

I want to install SQL Express (if not existing) and create a DB (if it not yet exists)

I have a solution with 3 different Projects in it:
- main application project
- database project
- Setup Project

I selected a SQL 2012 Express via pre-requisite and in the database Project the a publish.sql to create the database and also some other scripts that handling the table creation.
The target Connection string is like:
Data Source=.\SQLEXPRESS;Initial Catalog=master;Persist Security Info=True;User ID=sa;Pooling=False

Now my Problem(s).
When the SQL Express gets downloaded and installed - before the main setup procedure starts -the sa is disabled and ist password of the SQL Express installation is initially unknown to me.
But i need to connect to the master database and for creating my own DB, right ?

How does the best practise looke like to achive this , also without resetting everything if a local SQL Express Installation already exists ?


very thankfull for pointing me to the right direction.
cheers,
Jan