Here are the first three lines of Surah Yasin in transliteration:

Yaa Seen
(Ya-Sin)

Wal Qur-aanil Hakeem
(By the wise Qur'an)

Innaka laminal mursaleen
(Indeed, you [O Muhammad] are among the messengers)

Let me know if you need more of the surah in transliteration! https://surahyasinpdf.com/transliteration-of-surah-yasin/