The new schema is owned by one of the following database-level principals:
Objects created within a schema are owned by the owner of the schema. The ownership can be transferred but the schema owner always retains CONTROL permission on objects within the schema.
CREATE SCHEMA schemaName AUTHORIZATION dbo;
SELECT * FROM sys.schemas;
The default schema name can be seen in the principal table.
SELECT * FROM sys.database_principals;
and can be modified for the user
ALTER USER myUser WITH DEFAULT_SCHEMA = myschema
create USER myUser WITH DEFAULT_SCHEMA = myschema