I'm pretty good with html for a self taught person (not so much with javascipt). Is there a way when I create optional fields, to add them to the wp checkout process?
Yes. If you go to Settings->Optional Fields, you can create them. After you finish saving them, you can edit them and there will be an option to "add to page" which will insert the HTML for you. After it's inserted, you can move the field around manually by editing the HTML.
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