Hi Huister,
I agree with everyone here and especially with Joseph! dont go back to the store! (I hate dealers who try and con newbies) You can spend some time on this site and get all your information from the members!
Co2: Go in for a solenoid - pressurised tank set (5+litres size). JBJ is a standard brand and you can get it in shops like Nature Aquarium. See that it has a check valve, 2 dials, solenoid valve, needle valve and a bubble counter. Ask the guy to show you how it works. I just did a price check at NA and the set surprisingly was cheaper than C328!
Tank: you can go with Weeyang or get a Juwel set up if you have the cash. Saves time and energy for a new entrant to this hobby. Cant help you here on where to get Juwel in Singapore.Sorry. 
Chiller: Agree no need now for it. Just buy a standard aquarium fan for not more than S$15. Look for an AC fan, less hassles in setting it up.
Substrate: A good standard item which doesn't cloud the water and neither does it degenerate like certain ADA substrates is GEX. Go for the green bag. Its good value for money and I haven't had problems with it. C328 has them when I went there last.
"I grow old, I grow old. I shall wear the bottoms of my trousers rolled"
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