I worked as Credit card sales department before. For OCBC. But the info i can give you is. minimum requirement is 1500salary per month.

If you can made pay slip wif 1500 salary(muz look like original) per month. You will probably get your card... Easy bank to get it, is those local bank. Bcoz as i know. the approve rate higher for local bank.

Limit for the card is not sure. Is depend on your creditability history in all your payments for loan,etc.