How to report personal checks in tax return?

My employer does not have an accountant set up yet so he gives me personal checks every month for the last 6 months. This income will not be on my W2 as he's giving me checks. I want to show these checks as a part of my income (for health insurance purposes). How do I show these checks as a part of my income? How do I process these checks in my tax return? (I am not self-employed nor I own a business) Thank You.