There is no god worthy of worship except God and Muhammad (peace be upon Him) is His messenger
This declaration of faith is called the Shahada, a simple formula which all the faithful pronounce. In Arabic, the first part is la ilaha illa Allah - "there is no god except God"; ilaha (god) can refer to anything which we may be tempted to put in place of God -- wealth, power, and the like. Then comes illa Allah:" except God, the source of all creation. The second part of the Shahada is Muhammadun rasulu Allah: "Muhammad (peace be upon Him) is the messenger of God". A message of guidance has come through a man like ourselves.
la ilaha illa Allah, Muhammadun rasulu Allah
By making this declaration with good and pure intention, one can become Muslim.
To give you all the informations and if you have any questions. and to link you to the nearest Islamic center in your area wherever you are