If your side business is a sole proprietorship, the business is included in your personal income tax return on the T2125.  You should file the start up costs.  You will only show it as a loss carry forward, but it will be useful next year when you have business income.

Why would you complete a T4?  T4's are issued to employees.  You are not an employee if it is a proprietorship.  If you have any employees, then yes, you should do T4's and a summary for them.

If this "side business" is an incorporated entity, then you might be an employee, but if you received no income, you would not issue a T4 to yourself.

Maybe give us a few more details about what kind of a business, etc.