So if im enrolled in a key program, and its yellow am i stuck with it or can i still change or cancel it?
As noted above you can change it. Yellow just means what you're currently enrolled in.
If you're doing core units first then you decide to change, then you'll have no problem.
If you're doing non-core units like Sports Management or Torts then you decide to change then that means those subjects will go under your elective units.
Only time you'll really have a problem is if you do more than 8 non-core business units then decide to change your Key Program...but that's unlikely.
And now once ive chosen a key program, i have to choose nine units to do under that key program to go along with the 7 compulsory ones, and that is it for the first year?
Once you've chosen your Key Program, your recommended program is to do the Key Program + the 7 core/compulsory business units. The rest of your Key Program Units (8 subjects) are allocated into 4 semesters. So each semester after the first year means you'll do 2 of your Key Program Units + your electives (which are your Majors/Sub-majors). This is assuming you do 4 units a semester and don't fail anything.
7 core business subjects for 70 credit points.
9 Key Programs subjects for 90 credit points.
8 units of your choice for 80 credit points.
That's your course.