Learn Six Kalimas
First Kalima - Kalima Tayyabah
The word Tayyabah means Purity. The first requirement for a non-Muslim to become Muslim, is to say this kalima. By saying this, a person nullifies existing of any false gods and delcares Allah Almighty as the one and only God and Prophet Muhammad (PBUH) is His Messenger.
English Translation: There is no God but Allah, Muhammad is the Messenger of Allah
Second Kalima - Kalima Shahdaat
The word Shahdaat means Testimony or Witness.
English Translation: I bear witness that no-one is worthy of worship but Allah, the One alone, without partner, and I bear witness that Muhammad (PBUH) is His servant and Messenger.
Third Kalima - Kalima Tamjeed
The word Tamjeed means Glorification.
English Translation: Glory be to Allah and Praise to Allah, and there is no God But Allah, and Allah is the Greatest. And there is no Might or Power except with Allah.
Fourth Kalima - Kalima Tauheed
The word Tauheed means Unity.
English Translation: (There is) none worthy of worship except Allah. He is only One. (There is) no partners for Him. For Him (is) the Kingdom. And for Him (is) the Praise. He gives life and acuses death. And He (is) Alive. He will not die, never, ever. Possessor of Majesty and Reverence. In His hand (is) the goodness. And He (is) the goodness. And He (is) on everything powerful.
Fifth Kalima - Kalima Ishtaghfar
The word Ishtagfar means Forgiveness, Penitence .
English Translation: I seek forgiveness from Allah, my Lord, from every sin I committed knowingly or unknowingly, secretly or openly, and I turn towards Him from the sin that I know and from the sin that I do not know. Certainly You, You (are) the knower of the hidden things and the Concealer (of) the mistakes and the Forgiver (of) the sins. And (there is) no power and no strength except from Allah, the Most High, the Most Great.
Sixth Kalima - Kalima Rud-E-Kufr
The word Rud-e-Kufr means Rejecting the Disbelief.
English Translation: O Allah! Certainly I seek protection with You from, that I associate partner with You anything and I know it. And I seek forgiveness from You for that I do not know it. I repended from it and I made myself free from disbelief and polytheism and the falsehood and the back-biting and the innovation and the tell-tales and the bad deeds and the blame and the disobedience, all of them. And I submit and I say (there is) none worthy of worship except Allah, Muhammad is the Messenger of Allah.