Priveleges needed for

I already answered a similar question years ago on SOF : database - What privileges are needed to create\delete tables on a Microsoft SQL Server? Is dbowner ok? - Stack Overflow

Just to understand first the benefits of using roles :

• Roles are a part of the tiered security model:
• Login security—Connecting to the server
• Database security—Getting access to the database
• Database objects—Getting access to individual database objects and data**

Predefined database roles You may need to create your own, but you have access to several predefined database roles:

• db_owner: Members have full access.
• db_accessadmin: Members can manage Windows groups and SQL Server logins.
• db_datareader: Members can read all data.
• db_datawriter: Members can add, delete, or modify data in the tables.
• db_ddladmin: allows a user to create, drop, or modify any objects within a database, regardless of who owns.
• db_securityadmin: Members can modify role membership and manage permissions.
• db_bckupoperator: Members can back up the database.
• db_denydatareader: Members can’t view data within the database.
• db_denydatawriter: Members can’t change or delete data in tables or views.

Fixed roles : The fixed server roles are applied serverwide, and there are several predefined server roles:

• SysAdmin: Any member can perform any action on the server.
• ServerAdmin: Any member can set configuration options on the server.
• SetupAdmin: Any member can manage linked servers and SQL Server startup options and tasks.
• Security Admin: Any member can manage server security.
• ProcessAdmin: Any member can kill processes running on SQL Server.
• DbCreator: Any member can create, alter, drop, and restore databases.
• DiskAdmin: Any member can manage SQL Server disk files.
• BulkAdmin: Any member can run the bulk insert command.