What should I invest in for $200 per month? Any etfs or roboadvisors?

I would suggest that you invest $100 with stashaway robo-advisor and another $100 with syfe REITS+ program. It is a good way to get your feet wet into both the ETF market and also Singapore's REITs. You should not be looking at trading stocks as the commissions that the brokers charge will already take a good portion of your initial investment. Slowly build up your portfolio, then when your portfolio has a larger amount invested, say $20,000, you can start to look at other places to park your money. Hope this helped!

I'm personally investing on 2 portfolios via SYFE. their REITS+ portfolio gives you access to 30 local REITS and equity100 invests in US ETFs like s&p500 and nasdaq100. You can split into 100 per month so you get a bit of both local and US market For diversification.

once your portfolio is a bit larger say $50k or so, you might consider switching to an ETF via broker directly. :)