How to Create Job & Task In SQL Server

you should create a job in SQL below is a sample T-SQL for create a job via SQL agent

USE msdb ;
GO
EXEC dbo.sp_add_job
    @job_name = N'Weekly Sales Data Backup' ;
GO
EXEC sp_add_jobstep
    @job_name = N'Weekly Sales Data Backup',
    @step_name = N'Set database to read only',
    @subsystem = N'TSQL',
    @command = N'ALTER DATABASE SALES SET READ_ONLY', 
    @retry_attempts = 5,
    @retry_interval = 5 ;
GO
EXEC dbo.sp_add_schedule
    @schedule_name = N'RunOnce',
    @freq_type = 1,
    @active_start_time = 233000 ;
USE msdb ;
GO
EXEC sp_attach_schedule
   @job_name = N'Weekly Sales Data Backup',
   @schedule_name = N'RunOnce';
GO
EXEC dbo.sp_add_jobserver
    @job_name = N'Weekly Sales Data Backup';
GO

Get This Sp From MSDB Database From SQL System Database....