What should I do? Im going 30, female, single and self employed. Salary range from 3k to 3.6k. I do not have any liability, I wish to grow my wealth and have extra to lead a comfortable life?

As a start, i would suggest you buy an ETF rather than a stock. Another recommendation is SGREITS which can provide you a dividend income.

If you have zero background in investing, you have to decide first if you're planning to learn a lot and then DIY your investment.

If you're not going to DIY, you can instead purchase a financial product. You can easily set up a portfolio using a Robo Advisor or a Financial Advisor. But still make sure that you know enough to understand and not go in blindly. Please also note that if you don't understand what you're investing in and why, you may make the common mistake of selling low when markets aren't in your favour.

I would suggest that you start building a portfolio that pays some dividends immediately and also a portion of it purely for long term capital gain. As a single with no dependents and liabilities, you have the chance to build financial independence and retire a little bit more everyday until you build enough regular streams of income to replace your need to work.