How are you taking your insulin?

I just took my first dose of insulin... now my doctor didn’t talk much about it and the pharmacist was a dick so I thought maybe I’d come here and ask a couple questions. I am taking 17 units before bed since my sugars in the morning are high; I am on a diet and so far my sugars have been below 120 after meals..

My questions are...

1) is “Bed for bed” considered before dinner or actually before you lay down for bed? If it’s before you lay down do you eat something with it?

2) Do you take the shot SubQ (behind the arm) or belly? I asked my doctor she said tummy but the box says behind the arm.

3) Do I test my blood sugar before I take the shot or just do it since they are high in the morning?!