To request a new chequebook through iBusiness, follow the steps in the below video.
You will be able to monitor the status of your request through iBusiness -> Queue. Once the request shows under your "Completed Transactions", you should receive the New Cheque Book within 2-3 days.
For more guidance, please follow the below guide: How to Track the Status of Your Requests? (Video) / How to Track the Status of Your Requests?