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Hey,
to add/remove fields, have a look here on official docs:
https://docs.woocommerce.com/document/checkout-field-editor/
if you find this expensive then you can give a try to this:
http://localhost/wptest/wp-admin/plugin-install.php?tab=plugin-information&plugin=woo-checkout-field-editor-pro&TB_iframe=true&width=600&height=550
to style those, it will need a lot of css coding. this comes under custom feature request. you could try third-party plugin or hire a freelancer.