AAD will help when you attend intro lectures or Demo lectures for finance 1, accounting, etc you will see exactly what the course is about
As for your subjects, first you pick a stream (general, actuarial, business)
It will automatically assign you your 3 compulsory subjects
ECON10004 Introductory Microeconomics (Semester 1)
ECON10003 Introductory Macroeconomics (Semester 2)
ECON10005 Quantitative Methods 1 (choose a semester - most people do it in #1)
Now, you need to choose commerce electives (minimum of 1) and breadths (maximum of 3 breadth subjects at level 1)
I know its really early but, what Majors might you possibly be thikning about addressing the notion of considering of contemplating an attempt at?

Take first year commerce electives that match up with majors
ie: Finance = FNCE10001 Finance 1
Management = MGMT10002 Managing and Leading Organisations
i dont know the rest the handbook is useful for this
also use the handbooks for breadth, theres too many to talk about here.
In the handbook, look up major you might want to do
In your 3rd year, (wow ages away) you must pick THREE subjects to achieve that major
In order to do these subjects you need to have pre-requisite subjects in 2nd year
.........and in order to do THOSE subjects there could be pre-requisites in 1st year :O
Look all the pre requisites up in the handbook and see if your first-year plan will suit your second-year plan and ultimately your third year and major plan!
Sounds huge right now, but it will work out. Good luck!