Well first off, he has to be a muslim, of course. When he says the shahadah (testimony of faith), he has to fulfill these 7 conditions:
- Al-`Ilm (Knowledge of the meaning of the shahadah, its negation and affirmation)
- Al-Yaqeen (Certainty – perfect knowledge of it that counter-acts suspicion and doubt)
- Al-Ikhlaas (Sincerity which negates shirk)
- Al-Sidq (Truthfulness that permits neither falsehood nor hypocrisy)
- Al-Mahabbah (Love of the shahadah and its meaning, and being happy with it)
- Al-Inqiad (Submission to its rightful requirements, which are the duties that must be performed with sincerity to Allah (alone) seeking His pleasure)
- Al-Qubool (Acceptance that contradicts rejection).
And then he must try his best to do all the good deeds he can, and avoid bad deeds as much as he can. He must give to charity, be kind to his neighbors, perform prayers, etc, and must not backbite, steal, be rude to his parents, etc. On the day of judgement there will be a scale, one side will contain the good deeds, and one will contain the bad. If the good deeds weigh more, he will go straight to heaven. If that bad deeds weigh more, Allah will either forgive him,
or he will spend a certain amount of time in hellfire. Eventually though, all true muslims, who honestly believed that Allah was one, will enter paradise.. Although of course, one would try to get into heaven sooner rather than later.
