Redirecting CHECKOUT button Dawn Theme

[SusanDev]

Hello, 

I am trying to redirect the Checkout button to a Contact Us page.  I cannot find how to do this except this tutorial for vintage themes, but I am using a 2.0 theme.

I need to keep the Add to Cart button with variants and quantities that they will need, but the inventory has to be verified manually before we can take an order. So I was planning on using Draft Orders once the request is approved.

Does anyone have suggestions. 

Thanks beforehand!