An elders selected must be in accordance to the qualifications given by the Scriptures. If there are no elders present in a congregation the men should take the lead in the selection of elders. Most of the time the men of a congregation choose several mature men who screen names of men as to their qualifications. They are then placed before the congregation to see if there is any valid objections to the men chosen. If there are already elders present, the elders take the lead.
Elders have the authority in matter of procedure and expediency.
Who should know better than the elders of a congregation who might meet the qualificaitons for the eldership. The Elders can set up any procedure which does not violate what the Scriptures teach. For example, they do not have the authority to place a man in the eldership without considering scriptural objections, but it is up to them to decide how those objections are to be heard. They also have the responsibility for placing men before the congregation, but it is up to them to do it in the most expedient manner that they see fit. In absence of any binding method, the Elders of a congregation have the authority to search out, place before and ordain elders.