What documents do my fiance and I need to get married in Florida

I am a US citizen (Florida resident) currently working and living in Germany. My fiance is a German citizen with an approved ESTA. We are planning on visiting Florida for the holidays and would like to get married in January 2022 before flying back to Germany. I am reading differing information online about getting married to a foreign national and was hoping somebody on reddit can help us out.

So far I've read that he needs a passport and alien registration number. If he is coming to US on an ESTA, do I have to apply for any of the immigration forms ( i.e I-129F) so he can get this alien registration number?

submitted by /u/Confident_Ad_741
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source https://www.reddit.com/r/immigration/comments/qajuv3/what_documents_do_my_fiance_and_i_need_to_get/

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