NOTE: This is to be done after you've created a Database and I won't go into details as to how to create a Database or how to add a user to the database.
I retrieve info from MSDN TechNetabout the database roles and are as such.
Database-level role name | Description |
db_owner | Members of the db_owner fixed database role can perform all configuration and maintenance activities on the database, and can also drop the database. |
db_securityadmin | Members of the db_securityadmin fixed database role can modify role membership and manage permissions. Adding principals to this role could enable unintended privilege escalation. |
db_accessadmin | Members of the db_accessadmin fixed database role can add or remove access to the database for Windows logins, Windows groups, and SQL Server logins. |
db_backupoperator | Members of the db_backupoperator fixed database role can back up the database. |
db_ddladmin | Members of the db_ddladmin fixed database role can run any Data Definition Language (DDL) command in a database. |
db_datawriter | Members of the db_datawriter fixed database role can add, delete, or change data in all user tables. |
db_datareader | Members of the db_datareader fixed database role can read all data from all user tables. |
db_denydatawriter | Members of the db_denydatawriter fixed database role cannot add, modify, or delete any data in the user tables within a database. |
db_denydatareader | Members of the db_denydatareader fixed database role cannot read any data in the user tables within a database. |