first check the authentication mode of your database: connect to your database on SSMS, right-click on it, go to "Properties" and then "Security". Verify that SQL Server and Windows Authentication Mode is selected. This will allow you to create logins.
Then create your login: connect to your database on SSMS, expand your database, then go to "security" and right-click on the inputs, and then click "new login"
then create your user: go to the security folder inside your database, right-click users and "new user". Provide the username and login you created earlier. Do not forget to add the necessary permissions
About connection strings, this is a very good website, as already stated:
http:
Diego
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