Sacred Scripture—there is nothing in Scripture itself which tells us which books are to considered Scripture.
Infant Baptism-
Sunday Worship-The believers began meeting and celebrating Sunday though there is nothing in Scripture which says that they were to meet on Sunday.
The collection for the saints-Paul speaks of taking up the collection in advance for him to take with him after he preaches.
The Apostles appoint Steven and the others to deal with and disperse the assets, though there is no directive for either the collection or the dispersal of them in Scripture.
The laying on of hands in ordination. We know the Apostles did this, but there is nothing in Scripture telling them to do so or how to do so.
There is no directive in Scripture that the letters of the Apostles should be copied and shared with others, yet that is what the early church did. There is not even a directive that the letters should be kept or read over and over when the faithful gathered.
The Church does not spring from the New Testament, rather it is from the Church that the New Testament comes. The writings were all written for those who already believed and had come to believe through preaching. The writings also support and remind believers of traditions that were already in existence, they do not establish new ones.
Colossians 4:16 And when this letter has been read among you, have it also read in the church of the Laodiceans; and see that you also read the letter from Laodicea.
As for the other stuff, it's all stuff already mentioned in Scripture. How it's elaborated on is a matter of opinion. But the basis for all those practices is already in Scripture. So in effect the questions have not yet been answered.
But thank you very much for trying. For all the times that I have asked that, you are the first who's even ever made an attempt. The others just disappear, like they dropped off the planet.