Good advice there, I'd just add in that you'll want to check the flat share section of the Singapore Expats site.

Also, cooking for yourself is almost certainly more expensive than eating out in Singapore, since hawker food is so cheap: especially in the 'burbs you can get a meal for $2, or even $1 for breakfast (nasi lemak, noodles, etc). Many, perhaps even most, Singaporeans eat out 3x/day. As an expat the main reason to cook for yourself is to eat things you can't otherwise, like fresh salads or spaghetti that's not overcooked and cut up with scissors...

Last but not least, check out Wikitravel: http://wikitravel.org/en/Singapore