Urgent - need to buy treadmill - - diabetic

Urgent - need to buy treadmill - - diabetic
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My doctor says I am a borderline diabetic.
I have to do at about 45 minutes of exercise every day.
Because I have a knee problem I cannot use an elliptical exercise
appliance
I am about 53 years old.

I have NO clue about treadmills.
Can anyone pls help me ?

What treadmill should I buy ?
What features should I look for ?
What horsepower ?
What brand ?
Will I need to get an electric one ?

I am probably not going to run...but probably walk very fast on it.

I think "Basic Display info" like ... time spent, amount of calories
lost etc. is probably what I definitely need.

I would like to get one that is not too heavy and noisy.

Any help

Thanks,
Ayesha Hill