Why issue Employment Contracts?
There are many reasons why you need to issue contracts of employment. All of them help you the employer rather than the employee. You could get away with not giving people employment contracts. If you don't issue your own contract, the default Employment Law will apply to the employees. And as we all know, Employment Law tends to support the employee's rights rather than the employer's rights.
If you have your own contracts you can at least change some of those things, which will be better for you and your business.