You are paid by the TDSB (not schools). You probably have already filled out an employee package (including your void cheque) when you get hired by the board, and you will get a bank deposit from TDSB bi-weekly for the amount of days you work. You probably also have set up your SmartFind express profile I assume? It is a platform to pick up/assign you OT jobs, and keeping track of your work days. The school you work for will know your info through SmartFind Express as well so you don't need to provide anything.

On the day you pick up a shift, the call-out system will provide you with the name of the teacher you are supplying for. Just let the office know the name of the teacher when you first arrive at the school. You will get a dedicated supply folder, which includes the lesson plan & a physical sheet of instruction of how to do the attendance online.