If you want to show the form on the front end, you can use the acf_form() function to do it. This page should give you more idea about it: https://www.advancedcustomfields.com/resources/create-a-front-end-form/.
You can also create the selection yourself if you want. This page should give you more idea about it: http://www.w3schools.com/tags/tag_select.asp. To get the label and the value, please take a look at this page: https://www.advancedcustomfields.com/resources/select/.
If you don’t know how to code and don’t have time to learn it, I suggest you hire a developer to help you out with it, and I’d recommend looking for one on https://studio.envato.com/ or https://www.upwork.com/.
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