the most important thing when a person first embraces islam is to recite the kalimah syahadah.this is a pledge to free oneself all forms of syirik and to affirm in oneself that only allah s.w.t. has the absolute power and is worthy of worship.someone who is convinced of the existence and oneness of allah s.w.t. must also protect himself from syirik as it is a major sin. allah s.w.t.says in the al-Quran.