Visa not necessary, can i work?

Hi Valentina: Being able to visit Singapore without visa does not mean you will find a job and get a work visa - biut it is a good first step. Basically, eligibility for work visa depends on what the Singapore job market needs: If you have a good (and recognised by MoM) university degree in a field in demand in Singapore, you have good chances. Otherwise (and especially without university degree) not - you could then only qualify for badly paid manual labour or household help positions.
Please also note that Singapore is one of the most expensive places in the world - so those high salary benchmarks you may have heard about do not mean much. You need at least S$5000/month for a single person leding a normal lifestyle and renting an apartment (as opposed to sharing a flat with others, which is common due to the cost).