Go to POSB and open a Current Account. This account comes with a
cheque book. You may need to put in an initial amount, I am not
sure of this or how much. You need to have funds in the CA to issue
cheques.
Since you also have a Savings Account, you can ask for the CA to be
linked to the SA. This way you do not need to deposit funds into
your CA. Funds will be automatically transfered from your SA to
your CA.