Assalamo alikom
Dear brother,
It is great to have this care to present Islam to your friend. The best way to do so as sister Prosperous said is just to let him see how the good Muslim should be.
You know that Islam spread out in so many countries only when Muslim merchants went to trade in those countries. They did not go to call for Islam. They just showed how good Muslim should be and that was pretty enough to attract millions to embrace Islam. All praise be to Allah.
Another thing you should do: to try your best to acquire authentic knowledge about Islam to be able to answer any question you might be asked.
You can also give your friend the translation of the Noble Qur'an as a present.
Finally, let your friend love your very noble conduct, your very high and polite mannars, and your devotion to Allah in every thing you say and do.
The best way to call for Islam is to live as a good Muslim.