As a convert to the Church, I’d be more than happy to “educate you.” ;-) In the Latin Rite of the Catholic Church (i.e., the Roman Catholic Church, with which you are, no doubt, most familiar), the tradition is for deacons to be drawn from the married or single men of the Church, while priests and bishops are drawn from the single (and widowed) men of the Church.
In practice, the Latin Rite does allow (as an exception) the ordination of a few married men to the priesthood, but these men are given a special papal dispensation from the normal priestly promise of celibacy. This happens when a married man who has been ordained in another Christian church (usually from an Anglican/Episcopalian or Lutheran church) converts to the Catholic Church and specifically asks to be allowed to seek ordination as a Catholic.
On the other hand, the tradition in the Eastern Churches (read Eastern Catholics, Eastern Orthodox and Oriental Orthodox Churches) is for deacons and priests to be drawn from the married and single men of the Church while bishops are chosen solely from among the single (or widowed) men.
Hope that helps!
Welcome home!
Also, unlike a minister or nun, Holy Orders is one of the seven Sacraments (as is marriage).