We recommend that you first start by reading through the course materials, like a book, as this will help to give you a good understanding of the course content / topics covered and the way the course is presented.
You can start your assignments at any time and there are no specific deadlines for each of these - you can submit them to your tutor for marking at any time during your tutor support period (usually 6 or 12 months).
Within the student portal you will also find a recommended reading list. It is not compulsory that you buy these but you may find them helpful as a starting point for wider reading and research.
You will need to submit your assignments to your tutor for marking, one at a time and in numerical order.