Hi, I am currently earning roughly 35k per annum and am curious to earn Krisflyer miles efficiently and effectively. Can you give me some advice regarding best card usage / earning points?

You will need to read up at milelion.com. Lots of information on what needs to be done.

To keep it really simple for you. These should cover around 80% of most people transactions.

1) UOB Preferred Platinum Visa Card - For all Paywave transactions

2) DBS Woman's World MasterCard Card - For all online transactions

Of course there are also several limits, and other cards as well. There's also sign up bonus if you are new to bank or getting a new card.

I suggest you read up on milelion.com. And ask more specific questions.