Assalamu aleykum

welcome bro.
any dua is ok i guess its just u askin wat u want and being sincere.

The dua that the prophet called SAYYED AL ISTIGHFAAR IS:

ALLAHUMMA ANTA RABBI LAA ILAAHA ILLA ANTA, KHALAQTANIY WA ANA 'ABDUDA, WA ANA 'ALA 'AHDIKA WAWA'DIKA MASTATA'T. 'AUDHUBIKA MIN SHARRI MAA SWANA'T WAABUUU LAKA BIDHANBIY FAGHFIRLIY FAINAHU LA YAGHFIRU DDHUNUUBA ILLA ANTA.

Wish i cud write it in arabic, cz there are letters lackin in the english alphabet, found in the arabic alphabt
bt u can refer in HISNUL MUSLIM, the small booklet of Dua's. its under the section: Adhkaar yaum wallayla (duas supplicated in the morning and night)