Dear,
Firstly, Many many Good Wishes on your success !!!
No, actually there won't be any 'interview' upon landing. U'll be asked some basic questions by the CBSA/IO, all regarding your 'landing', 'PR Card', 'PofA' & 'place/duration of stay' etc. only. All simple & generic. U may need the following:
1. Passport with Visa. -off course.
2. COPR
3. PofA. -for cases 'without' AEO & family class. (Cash, B/Draft, TCs, latest Bank Statement, Wire Tfr Record)
4. Passport size photos. -qty 2-3 each, for PR Card. (it may not be needed, but good to carry)
5. PR Card Application (IMM 5444E). -this u can do it there, Or carry it before hand (filled) for ease.
6. Goods to follow List (Form B4E). -this u can do it there, Or carry it before hand (filled) for ease.
7. SIN Card Application (Form NAS 2120). -NOT NEEDED at the a/port. But needed later.
8. Kids Immunization Record. -NOT NEEDED at the a/port. But needed later for School Admission.
9. If u r driving, remember to take ur veh docs. If u r keeping the veh at Canada, 'export' it from US first (carry the docs) and perform 'import' documentations, as well in Canada.
Hope that helps.