Singapore Armes Forces seems to be a good place to learn Hokkien from scratch, at least the swear words.
Jokes aside - if you don’t speak any Chinese yet I’m sure you’re out of luck with regards to structured learning. I had classmates - native classmates with fluent Cantonese and Mandarin - who struggled to find places that teach Shanghainese, so that he could speak to his elderly relatives in the mainland.
If you speak some, academia might be your best guess. I think there might be a few places that teach Fujianhua / Hokkien in Taiwan to casual learners, but all else I have seen were courses for advanced sinology students.