How to replace 'add to cart' button with a 'submit' button

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I'm brand new to Shopify and am selling customized products on my page. I need the customer to be able to choose customizations from multiple drop down menus and file uploads (which I already have on the product pages) and have them submit those customizations to my email. I need to be able to add a button that allows me to see their customizations prior to them checking out so I can send them an invoice, as the prices will vary depending on what the customer has selected. 

I've spent hours reading through other posts in the community but I haven't had any luck

If someone could help me out I would be so grateful!