Well I applied as a Co-op student in those rez forms, but I got acceptance to Engineering I (without Co-op) Is that enough for the switch or do I need to make this change elsewhere?

All you have to do for Eng Coop (at least what I had to do) is take a class (I believe 1E00 or something like that) which deals with resumes and the like. After that you just have to pay the fees and you have access to the job database.

To graduate with the Co-op designation you need 12 months work experience I believe.

Either way, it's not too late because there is no switch to be made.

Originally Posted by DannyV

To graduate with the Co-op designation you need 12 months work experience I believe.

It is 12 months.

Don't worry about not having applied to co-op. You can always change into it (or out). When you decide what department you want for your second year, you can add co-op on there (along with management, society or international).
I don't think I was registered in the co-op program until I started my second year, but I am now in it.