I second every word in the post above. As a person fortunate to be a part of this field, I'd share some observations with you.
1) arm yourself with a tertiary university degree. Airlines such as SIA prefer grads. There are a lot of aeronautical/ aerospace engineering grads in flight schools, as I type, To give you a good idea of the competition you will be facing. It's a shark eat shark world in the job market.
2) shed off the rose tinted glasses and be prepared to be unemployed for some time no matter what flight schools sell you.Research as much as you can with regards to the industry and trust nobody but yourself.
3) Be prepared to work with and around people with little or no passion for aviation when you get in. You will find some real gems in the industry though.
4) When it comes to a flight school, don't run after a brand name, but the quality of flying and talk to several students first instead of marketing executives.
Finally, If you are really passionate about flying, get in !