Personally, if you're young, I'd advise you to invest in US/Global markets instead. SGX is rather limiting in growth imo. Historically, US Indices have done well since the 1900s, returning approx 9.8% per annum. Global indices do better in some decades and worse in some, but generally they follow each other since the US markets form a large portion of the world's economy.
Some I would consider are:
S&P 500 ETFs: CSPX (LSE), IVV/VOO (US)
Global Index: VWRA/IWDA (LSE)
Global Ex US: VEU/VXUS (US)
Moreover, such ETFs do not have minimum lot sizes, meaning you can buy 1 share or 2 shares if you so choose to do so. Do note that naturally, buying more shares will reduce the impact of the comms on your cost price.
You can check out more on Index Investing on this post I wrote!
If you're uncertain on which broker to choose, I would advise Tiger Brokers as a good starting broker. Low commissions, relatively easy to use and has access to US, SG and HK markets. If you wish to look at other brokers, you can also check out my comparison here!
Hope this helps!