How should I start investing at 18yo with $10K?

I am 18 years old. Currently, there is $10K in my bank acc (saved up myself from a part-time job). I will like to start investing in either STI ETFs, Bonds ETFs or REITs as I have low to medium risk appetite. Aiming for at least 3-5% dividend.

I am considering getting a custodian account.

Are STI ETFs, Bonds ETFs or REITS good choices for a new investor like me? Or should I save up more money first and invest later?

REITs and ETFs are the best way to get started. You may want to keep a smaller part in short term bond ETFs (Bond ETF UCITS preferably for tax reasons) which you can plough into the stock market in case of weakness in Equities. Do check out kristal.AI wherein you can buy a few Kristals for 10K (and upto 50K) completely free of any advisory fee (except ETF fee which ETF providers take) You can then even set up a SIP on an ETF like SPY or VTI or VWO.

You can also run the Algorithm to check what that suggests for your profile. Do reach out to our advisors or support team if you need help.

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Hi Anonymous, firstly, congrats in making the decision to start investing at an early age! With time, you can allow your money to compound more. This is on top of the experience you gain over the years, making you a better investor over time.
If I were you, I would invest in STI ETF for a start. As of 21 Oct 2019, the SPDR STI ETF had a distribution yield of around 3.8% (ref: https://www.ssga.com/sg/en/individual/etfs/fund...), which is within the range you are looking for.
ETFs allow investors to invest in a low-risk manner. In terms of risk profile, shares and REITs have higher risk. Once you have gained some experience in the stock market, you can consider venturing into stocks and REITs. Hope this helps!