Magento Checkout customization

Hi, I have a checkout layout with a phtml file. It’s a static file with a new design for the checkout. I have to integrate checkout entirely. Right now my problem is the shipping and billing address. It’s the same as the default Magento but with a new design. Having only a phtml file, I don’t know how to integrate the data to this billing and shipping address using the default Magento way. I think I only have to call the js file in that. I did that but it didn’t help me at all. Please, I am losing my hope here. Help me out if u are available. I need to complete this asap. I don’t know what else to add.

submitted by /u/Outside-Blood-5389
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