ObaKlaz:
To mention a few:

1* Genuine salvation/conversion.
2* Holiness & wholesome living.
3* In-filling/baptism of the HolyGhost.
4* Spiritual gifts.
5* Thorough & sound knowledge of the scriptures.
6* Profound knowledge of and adherence to ministerial ethics.
7* Maturity.
8* Humility
9* Selflesness
10* Leadership skills

Topgainer:
It depends on the kind of Pastor or Bishop you want to be.
If you want to be among the Pentecostal fraudsters you will need to enter any of the Churches and serve the man of gods like a slave would serve his master. You dare not break out except the man of god allows you, otherwise he bring upon you all his intimidation arsenals like empty curses, he may accuse you of stealing his church offerings, he will warn and threaten his subjects not to associate with you. But then you will learn the arts of extortion and twisting the Bible to fund your lucre. The gods of men may be magnanimous enough to take you to the Coven where you will be initiated into the prophetic gang, provided you return tithe of what you make from your own church business.
If you want to serve God selflessly, you don't have to be a Pastor working with any Church, with financial targets on your head. You can be a pastor in your family, in your school, in your office, in your neighborhood and anywhere you find yourself. The Character you exhibit preaches more and influences the people around you to believe in your God. You will also enjoy inner peace because your love of the things of the world and crave for material acquisitions through extortion of the gullibles will be minimal.