Did the 1C AD have congregations? Yes. So that is not the right question. The right question to ask is:
How were the congregations arranged? Were they hierarchical as the Watchtower congregations are today? No. There is every evidence in the NT that each congregation was an independent unit with its own locally elected elders. The congregations were scattered communities of believers in Christ whose common bond was a love for each other that came as a result of being "in Christ"
Did they have elders? Yes. But again the question is: How were these elders appointed?
At 1 Tim :1-7 Paul gave an outline of what qualified a man to be an elder. These instructions were given to Timothy, who was himself an elder evidently in the city of Ephesus. [1Tim 1:3] so that when he came to appoint them he would know what these qualifications were. In turn, as this letter was distributed among the congregations, the local elders would have these instructions. To conclude that Paul was an elistist member of a "GB" is an absurd allusion that has no reccomendations from the NT. Timothy himself had been appointed by the older men of his congregation by the laying on of hands [1 Tim 4:14]
He was not:
1 Appointed by a "Governing Body" centrally set up in one location, evidently in Jerusalem. We know that Jerusalem was destroyed in 70 AD and the Christians were thus scattered from there. As near as we can determine, the first letter to Timothy was written about 63-65 AD and the second about 65-67 AD [NASB Study Bible Notes] So the "GB" if there was one, would have been rather busy at this time trying to preserve itself rather than keep tabs on a youngster from Ephesus.
2 Appointed by a traveling overseer representing a "GB" on the recommendation of the local body.
Did they have Deacons? Yes. And evidently Deaconesses to. [Rom 16:1] Phoebe is referred to as a "minister" [NASB, NW "T"] "Deaconess" [CB Williams NT] The word is the feminine form for the male "ministerial servant" at 1 Tim 3:8, which is why the NASB Study Bible says: "When church related as here, the term probably refers to a specific office, ie a woman deacon or deaconess." [page 1658]
Did they preach? Yes. But:
1 There is no evidence whatsoever that it was incumbent on all in the local congregation to evangelize. Eph 4:1 specifically says that Christ gave some to be evangelists.
2 When giving the qualifications for elders and deacons in the local churches Paul pointedly ignored the preaching work, emphasizing instead the empathy the prospective elder had for the fellowship of believers. Elders were not for the purpose of making converts, but building up the local fellowship.
3 There is not a single instance where people became believers as a result of a door-to-door ministry. Every time we see Paul or Peter or even Phillip preach, it was always in the open, in the public. The early Christians only came to people's homes when invited to do so. [Acts 10:24, 16:34] They never entered a home uninvited. Using texts such as Acts 5:42 and 20:20 is straining the plain meaning of the text. The idiom used for "From house to house" actually is better translated as "privately".
Hope this helps.