Hi Jennie,
I found this in the Smith Bible Dictionary.
Minister
This term is used in the Authorized Version to describe various officials of a religious and civil character. Its meaning, as distinguished from servant, is a voluntary attendant on another. In the Old Testament, it is applied
(1) to an attendance upon a person of high rank, Exo 24:13; Jos 1:1; 2Ki 4:43;
(2) to the attaches of a royal court, 1Ki 10:5; 2Ch 22:8 ; compare Psa 104:4;
(3) To the priests and Levites. Ezr 8:17; Neh 10:36; Isa 61:6; Eze 44:11; Joe 1:9; Joe 1:13.
One term, in the New Testament, betokens a subordinate public administrator, Rom 13:6; Rom 15:16; Heb 8:2, one who performs certain gratuitous public services. A second term contains the idea of actual and personal attendance upon a superior, as in Luk 4:20.
The minister's duty was to open and close the building, to produce and replace the books employed in the service, and generally to wait on the officiating priest or teacher.
A third term, diakonos, (from which comes our word, deacon), is the one usually employed in relation to the ministry of the gospel: its application is twofold, -- in a general sense, to indicate ministers of any order, whether superior or inferior, and in a special sense, to indicate an order of inferiors ministers.
I thought this might help you understand where the term came from
mercy, peace, and love
Kat