Sure.
So my dead-easy method is as follows:
Step 0: figure out how much you can safely invest. Don't forget to keep an emergency fund equal to six months of expenses.
Step 1: put "110-minus-your-age" percent in stocks.
Step 2: put the rest in bonds, or as cash in your CPF.
Step 3: go to the pub.
Step 4: come back in a year and rebalance your portfolio - sell or buy to bring the percentages back to "110-minus-your-age in stocks and the rest in bonds".
That's it.
You can basically go off and do that right now. But here's a bit more detail, if you'd like to know the how and why.
Firstly, the emergency fund. That's absolutely critical - it's a safety net in case you lose your job or get hit by a bus and your insurance doesn't cover it. It means you won't go broke or have to flog your stocks or anything like that.
Secondly, the "110 minus your age" thing. When you're young, you can afford to have a lot of money in stocks - on average, stocks make more than bonds, and if you have one bad year like 2008, you can afford to wait for everything to come back. When you're close to retirement, though, you need to avoid big drawdowns, because that money's supposed to be funding your retirement, and if you lose 30% of it you'll have to cut your withdrawals. So as you get older, you should have less in stocks and more in bonds.
(Normally the rule is "100 minus your age"; I'm tweaking it because bond yields are particularly low right now, so you don't want to be too heavy in them.)
As for what stocks and bonds to choose: for your stocks component, you'll mostly want ES3, the STI ETF index fund. This fund buys and holds all the big stocks in the Straits Times Index. (If you're young, and comfortable with risk, you can look overseas for better returns - VWRD on the London stock exchange is a great fund that buys and holds all the big stocks in the world. You can buy that and sit on it for decades. As you get older, though, you should bring all your money back home to Singaporean investments.)
For the bond component, you'll want to put it mostly in CPF, because the 2.5% or 4% or whatever it pays is massively above market. It's free money. For anything you can't squeeze into CPF, put it in A35, the bond equivalent of the STI index fund I mentioned above.
Thirdly, rebalancing: let's say you start the year with a 70-30 allocation to stocks. Let's say they have a great year, and by the end of the year, stocks are 80% of your portfolio instead of 70%. At the end of the year, you should sell stocks and buy bonds so your allocation goes back to 70-30 (or 69-31, because you're a year older, but near enough is good enough).
This forces you to sell your winners (which are expensive now) and buy the losers (which are cheap now). It only takes ten minutes a year, and it's proven to add 1-2% to your portfolio returns - and over thirty years, that's A LOT OF MONEY.
Fourthly, the pub. I like Hendricks and tonic, with a stick of cucumber if you're somewhere really classy.
And since you asked what I have, here's my portfolio right now, and the ETFs I use to implement it. I'm US-taxed, and US- and Australia-focused, rather than Singapore-focused, so you won't want to use the same funds I do, but the asset allocation idea is the same. (Also I use a few more asset classes than the broad stocks-and-bonds categories listed above, but that's because I like to overcomplicate things.)
Also come to think of it, it's coming up to my annual rebalancing time. Time to take some profit on my stock holdings. It's been a very good year.
Stocks: 79%
US: 45% (SPY and VO)
Developed markets ex-USA: 29% (VEA)
Emergings: 5% (VWO)
Bonds: 21%
USD IG corp short-term: 9% (CSJ)
USD long-term municipal bonds: 9% (CMF)
USD HY corp: 3% (JNK)
