You will be liable to pay the tax
For the 2017 year of assessment (1 March 2016 - 28 February 2017)
if you earned less than R75 000 you will not have to pay any tax
The annual budget speach is this week and the new tax rates will be released but most likely that R75 000 will increase to R78 000+- so if you earn less than that tax would not even be applicable on you,
Should you earn in a tax year more than R75 000 then would be able to do your own tax return and payments via E-Filling on SARS's website : http://www.sarsefiling.co.za/
But if you earn less than R350 000 then you don't have to submit a tax return, but there is nothing that stops you from submitting one if you feel that you want to.
You can use https://www.taxtim.com/za/ to help you with other questions
you might have.
You can potentially bring down your tax-able income by showing a loss in capital value of your equipment that you purchased that is now worth less than it was when you initially purchased it, but these are all things you should discuss with a tax practitioner, I am not entirely sure how you will show a loss in capital value as a sole-proprietor, that is what you will be since you are not a company.