The 2nd edition Sororitas book gave the rankings as follows
The Ecclesiarch.at the top
Below him are the five Cardinals Palatine who serve within the Imperial Palace, the cardinals terran (who serve the diocese of the holy synod on Earth), and the cardinals ministra (who serve the diocese on and around Ophelia in the synod ministra). Most of their work is traditional and also the long debates over policy implementation.
Next are the Arch-Deacons who oversee the running of the Ministorum as an organisation. The parishes of the diocese have deacons, who are in turn served by the deans and lesser clerks.
Each diocese also has a cardinal and team of preachers, bishops, priest generals, etc, who work the spiritual side of the organisation, and separately from them the confessors and arch-confessors.
Schola progeniums are headed up by a special rank of priest known as an Abbot.
Somewhat separate from any given diocese are the the missionarus galaxia and the missionaries
There are also a bunch of very minor functionary ranks such as logistoras, quire masters, reliquindus, etc. Behind the scenes administration positions.
Beneath everyone were the ranks of the frateris militia, not formally part of the church.
jonolikespie wrote:http://warhammer40k.wikia.com/wiki/Ecclesiarchy#Adeptus_Ministorum_Hierarchy
Firebrand seems out of place on that list - it's a type of redemptionist, not a formal rank.