I am employed at a company where I pay PAYE/SITE tax which is deducted from my monhtly salary. I want to start my own small business which I will run from home.

I am in the process of registering a defensive name under which I will trade.

My questions are:
1- Do I need to register the business for Turn Over Tax with Sars?

2- How does having a sole trader business affect my own tax?

Any help will be appreciated?