Please contribute generously in order to ensure the continuity of our website InshaAllah.
Praise be to Allah.
He should say al-shahaadatain first, then he should purify himself for Salat and he can perform ghusl (complete bath) because the prophet (peace and blessings of Allah be upon him) ordered some of his companions to perform it when they accepted Islam.See question #179 for an explanation of the two testimonies of Islamic faith.