Is it necessary to take a notepad into the interview?
Not necessary, KSUCPM will have a large packet with a ton of info inside.
Should I wear a suit, or is a blazer with slacks and a blouse fine?
As long as it looks professional, clean, and fits well either will be fine.
What's more appropriate heels or flats?
The young lady who interviewed with my group had on low heels. There is quite a bit of walking at Kent.
Can't speak for CSPM, however, I did interview with Kent, accepted, and will be attending. Honestly, just be yourself and normal. They just want to make sure that you're a normal functioning person! I had a blast and loved it!!! Be sure to check out the interview feedback section.
Podiatry Interview Feedback List | Student Doctor Network